Andrew Welham wrote:

8. Is there any other way to build right up against a boundary without
impacting the neighbours land?
9. Any concerns the building inspector would have when they see this??

I will let others answer the rest of the questions but you will need to
consider the implications of the Party Wall Act since you want to build so
close to your neighbour assuming his house is also close to the boundary.
Details are here

http://www.opsi.gov.uk/ACTS/acts1996/1996040.htm

The effect of the Act is to ensure that any work you do is done a in
satisfactory way and does not cause problems to your neighbour. You have to
pay all the costs associated with the Act.

Peter Crosland