Thanks for your replies... Yes, it is in fact an aircraft managed directly by the CAA (or will be...!) as an amateur built kit aircraft that's built outside of the remit of the LAA (sadly!).
I am just jacking the project up with the CAA and have yet to identify the right people to survey, inspect, sign for the aircraft.
The reason for the post is that I saw a second hand unit for sale which I am consider purchasing!
CAP733 - have read this but it only seems to talk about radio equipment, not avionics etc. More than happy to be corrected!