SMS marketing remains an effective direct channel for UK early-stage founders and e-commerce sellers when executed within the law. The first requirement is explicit consent from recipients before sending commercial messages; without it, campaigns risk serious penalties and damage to reputation.
This guide outlines the core rules, practical steps for compliance, timing considerations, and creative approaches that work for British businesses. Following these practices helps protect your company while building genuine customer relationships through text messaging.
Understanding Consent Requirements
Consent forms the foundation of lawful SMS marketing in the UK. You must obtain clear, affirmative agreement from individuals before sending them promotional texts. This consent needs to be specific to SMS marketing and not buried in general terms and conditions.
Practical steps include using double opt-in processes where a person signs up via your website or checkout and then confirms their mobile number by replying to an initial text. Record the date, time, and exact wording of the consent for each contact. Make it easy for people to withdraw consent at any point, typically by replying STOP or contacting your customer service.
For existing customers, the rules allow limited messaging related to previous purchases, but this still requires transparency. Always provide an immediate and free method to opt out. Review consent regularly as preferences can change over time.
Performing TPS and CTPS Checks
The Telephone Preference Service (TPS) and Corporate Telephone Preference Service (CTPS) maintain registers of numbers that have opted out of unsolicited marketing calls and texts. Before sending any commercial SMS, screen your contact list against the current TPS and CTPS registers.
Download the latest files from the official TPS website or use an approved screening provider that updates daily. Automate this check within your CRM or SMS platform to avoid human error. Even one message sent to a registered number can lead to complaints and investigations.
Keep records of every check performed, including the date and outcome. These logs demonstrate due diligence if challenged. Remember that registration on these services can occur at any time, so re-check lists before each campaign rather than relying on older data.
Choosing the Right Timing for SMS Campaigns
Timing affects both compliance and response rates. Avoid sending messages outside reasonable hours. For most UK businesses, this means between 8am and 9pm on weekdays, with even more caution at weekends. Early mornings before 9am and late evenings after 8pm tend to generate higher complaint rates.
Consider your audience and product type. A fashion retailer might see better engagement on Thursday or Friday afternoons when people plan weekend outfits. Grocery or household brands often perform well mid-morning on weekdays. Test different send times with small batches and track delivery, open, and response metrics.
Space out campaigns to prevent message fatigue. One or two messages per month is usually sufficient for most customer lists. Seasonal peaks such as Black Friday or Christmas require careful planning to avoid appearing spammy during already busy periods.
Crafting Effective Creative and Examples
British audiences respond best to SMS that feel helpful, concise and personal rather than sales-heavy. Keep messages under 160 characters where possible. Start with the most important information and include a clear call to action.
Useful examples for UK e-commerce businesses include:
- Order updates that add value: "Your order #1234 has been dispatched and will arrive by Friday. Track here: [short link]"
- Targeted offers based on past purchases: "Thanks for buying the wool jumper. Complementary scarves are 15% off this week. Use code WARM15"
- Abandoned cart reminders: "Left something in your basket? Complete your purchase before midnight for free next-day delivery."
- Feedback requests: "How did you find your recent delivery? Reply with 1-5 or visit [short link] to tell us."
Use tone that matches your brand. Humour can work for some British retailers but avoid anything that could be misunderstood. Always include your company name or a recognisable short code so recipients know who is contacting them. Provide an opt-out route in every message.
Technical and Platform Considerations
Choose SMS platforms that automatically handle TPS/CTPS screening, consent logging, and opt-out processing. Most established UK providers maintain these features as standard. Test delivery routes because some networks filter messages more aggressively than others.
Implement short links that redirect to properly branded landing pages rather than raw URLs. Monitor key metrics such as delivery rates, click-through rates, and opt-out frequency after each send. Use this data to refine future campaigns and lists.
Integrate SMS with your other channels. A text message works particularly well as a follow-up to an email or as a time-sensitive alert that complements social media activity. Ensure all customer data is stored securely and processed in line with data protection obligations.
Common Pitfalls and How to Avoid Them
Many new UK founders inadvertently breach rules by purchasing contact lists or assuming website sign-ups automatically cover SMS. Bought lists almost always lack proper consent and should never be used for marketing messages.
Another frequent mistake is failing to update screening processes when TPS and CTPS rules or systems change. Set calendar reminders to verify your compliance procedures every quarter. Train anyone who handles customer data on the importance of consent and opt-out requests.
Over-messaging is a quick way to increase opt-outs and complaints. When in doubt, send less frequently but make each message genuinely useful. Review every template before launch to confirm it contains your business identity, a clear purpose, and an easy opt-out method.
Building Sustainable SMS Marketing
Focus on quality over quantity. A smaller, highly engaged list that has given explicit consent will outperform a large, poorly targeted database. Use SMS for moments that matter most to customers, such as order confirmations, delivery alerts, or genuine personalised recommendations.
Combine SMS with strong email and social strategies to create a balanced growth plan. Regularly audit your processes and adapt to evolving expectations around privacy and commercial messaging. Founders who treat customer contact details with respect tend to build stronger long-term relationships and brands.
Organisations such as Loomworks in West Yorkshire support early-stage e-commerce founders with free resources and mentoring that can help refine these marketing approaches alongside other aspects of building a sustainable business.
Frequently asked questions
Do I need consent for every SMS marketing message in the UK?
Yes. You must have explicit prior consent before sending commercial SMS messages. The only limited exception relates to existing customers for transactional messages directly related to a recent purchase, but even then transparency and an easy opt-out are required. Always err on the side of obtaining clear permission.
How often should I check the TPS register before sending campaigns?
Best practice is to screen your entire list against the latest TPS and CTPS data before every campaign. The registers are updated daily, so using data that is more than a few days old increases risk. Automated screening tools make this process straightforward and reliable.
What are acceptable sending times for business SMS in the UK?
Generally between 8am and 9pm on weekdays. Many businesses restrict commercial messages to 9am-8pm to reduce complaints. Weekend timing should be even more conservative and closely tied to when your audience is likely to find the message useful rather than intrusive.
Can I use humour in UK SMS marketing messages?
Humour can work if it fits your brand voice and is unlikely to be misinterpreted. However, keep it light and ensure the main purpose of the message remains clear. Always include your company name and an opt-out option. Test humorous messages on small groups first.
What should I do if someone complains about my SMS marketing?
Respond promptly, apologise, remove them from your list immediately, and log the complaint. Investigate whether the consent or screening process failed. Use complaints as a signal to review your overall approach. Persistent issues may require pausing campaigns until root causes are fixed.
Related reading: Developing thought leadership content as a UK founder, Amazon SEO guide for UK marketplace sellers, How to design a high-converting referral programme UK. Browse all marketing & growth guides or apply to Loomworks.