As I've mentioned in another post, I'm fitting Jen's new kitchen.

It turns out that the previous kitchen was cunningly designed to 5/6 scale, to make everything fit. This means that the new units are bigger.

In the corner of the kitchen is a floor-standing gas boiler, which we're going to hide under the worktop. Obviously, we need to leave access to it. This is accomplished by leaving a gap between two of the units (at right angles to each other).

My question: is there a legal (or recommended) gap that we should try to leave for access to the boiler? We don't actually have much leeway to move the units, but I'd like to know if this is something that a surveyor is likely to comment on when it's time to sell the flat.