Manchester has a deep pool of ecommerce brands and an equally deep pool of agencies selling to them. The usual shape is a strategist you meet at the pitch and an account run 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 gets lost in a handover and there is nobody to bill for internal admin. You email the person doing the work. The about page explains why that is the whole structure.