my experience is mixed anyway here goes:
1) Had boot adjusted by Vines of Gatwick (VOG), they broke the adjuster, replaced adjuster, attitude was "well these things happen". SA is no longer there.
2) Had services by VOG and replaced evaporator, fixed hot console issue with good service
3) Cooper Cobham oversprayed my car and i had to go back three times to correct, but they did.
4) Cooper cobham replaced my seat padding and headlight unit, just found that my rubber seal from the unit is missing.
So all in all VOG are not bad, not a dog anyway. Cooper have a good rep I view them as variable.