London has more small ecommerce brands per square mile than anywhere else in the UK, and more agencies selling to them. The pitch is usually the same: a team, a strategist you meet once, and an account handled day to day by whoever joined most recently.
The freelance version is simpler. One person builds the flows, writes the campaigns and reads the reporting, so nothing is lost in a handover and there is nobody to bill for coordinating. You email the person doing the work. That is the entire structure, and it is why the about page is short.
Being in the same time zone helps more than being in the same postcode. Same working hours, same trading calendar, same VAT and consumer-rights context.