If you cannot find comments about your local dealer here then there are 4 other forums run by Martin Lewis - two of them have been going now for nearly 3 years so there are plenty of comments about LR dealers and service agents over on them

D3 and RRS have the most comments as they have been running the longest
http://www.disco3.co.uk/forum/dealership-feedback-vf23.html
http://www.rrsport.co.uk/forum/dealership-feedback-vf12.html

FFRR and Defender2 have only been on the www for 3 months so there is less info on them than here
http://www.fullfatrr.co.uk/forum/dealership-feedback-vf12.html
http://www.defender2.co.uk/forum/dealership-feedback-vf12.html How can carbon have a footprint, it has no feet?
Now driving - RRE Coupe Dynamic Lux Auto with Plus pack, Fuji White, Ebony, SD4 with tow pack
Gone - 2010MY FFRR TDv8 Stornoway and Ivory, Privacy - the pace of a TDv8 RRS, the incomparable grace of a Range Rover
Gone but will be missed- RRS Tdv8 HSE Stornoway Grey with Ebony Leather
Gone (only a little missed) RRS Tdv6 2.7SE Giverny Green/Aspen
Defender 90 County HT in Epsom Green