We help UK businesses grow by testing what works.
Growth Theory is a marketing agency for restaurants, online shops, local services and growing SMEs. We plan, test and measure every channel, so your budget goes into what actually brings in customers.
Why we're called Growth Theory
Too many small businesses spend money on marketing because someone told them they should, then never find out what it actually delivered.
We started Growth Theory in 2026 to do it differently. Every campaign starts as a theory: a clear idea of who your customers are and what will make them act. We test it, measure it and keep only what works.
Today we help businesses across the UK with paid ads, SEO, AI search visibility, social media and TikTok Shop, product content and websites, all planned together as one growth plan.
How we work with every client
Test, don't guess
Every idea is tried, measured and improved. Decisions come from data, not hunches.
Plain English, always
No jargon and no smoke and mirrors. You always know what we are doing and why.
Every pound tracked
We focus on enquiries, bookings and sales, not vanity numbers like likes and impressions.
Partners, not suppliers
We treat your business like our own and grow with you over the long term.
Let's grow your business together.
Start with a free marketing audit and see exactly where your next customers can come from.