“ The idea that significant high street trade comes from 7 parking bays seems to be imaginary rather than evidenced by anything.
Assuming that those bays are in constant use, for half an hour each time, for 9 hours (ish) of shop opening time, that's 126 cars parking during the day, at most. Let's assume one potential paying customer per car, so 126 (potential) paying customers.
Distribute those out between the 40(ish?) units nearest to those spaces, and that's an average of 3 (potential) customers per unit.
So, unless all of these customers are visiting multiple units or are more heavily favouring one specific unit, I can't see this making a big difference to any of the traders. ”