That's a bugger of a mega size boiler for a flat in this day and age, and what twat stuck it in that awkward corner.

Boxer Towers with its extensive living quarters, from which I have frequent difficulty evicting relatives from the former colonies who find it too comfortable after the weekend that they were invited for, only has a 2' 6" x 2' O" x 9" item hung on the wall at cat perching level.

That boiler looks old, are you sure that it might not be better long term to consider a smaller, more efficient unit that does not impinge upon your valuable space, whilst the opportunity arises?