Good alarm fitter in Bromley area

[nicecupoftea]

Hi all,

Wanting to get a decent alarm on my new car - Clifford Concept 300 or something like that.

Any recommendations on places that will do the job properly, not full of spotty gits who fit stereos all day long and taking everything out for a thrash for "testing" purposes ?

Further afield is fine if they're any good!