+1 what RKQ has said - a picture is worth a thousand words.
We don't usually see pictures on AAM at least I seldom see any posted and it might be mentioned in the posting FAQ. You'd have a get a map or a google earth image, post it somewhere that accepted images or allowed you to put up an album and post a link here.
Its all a bit academic, the posting of pictures - you really need to get someone competent to call around and have a look at the site, the adjoining buildings and densities, what's permitted in the Development Plan, then do a sketch design to analyse the problems and address them for both the new and existing house in terms of reduction of the garden etc., then talk to the planners.
ONQ.
[broken link removed]
All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.