VERY GOOD POINT !
Fortunately the L/L is a friend of min who has already agreed to the changes, which will only include the additional CU in the cupboard where the current CU is. 2 to 4 holes within the wooden flooring and whatever wall sockets are required.
Again I typed up the AST so am fully aware, however with him also being into his Hifi, will benefit from it when I finally move out.