Independant Alfa garage in Hertfordshire?

Can anyone recommend a good Alfa specialist in the Hertfordshire area?

I had my pride and joy a September 04 registered 156 GTA 3.2 24v V6
Sportwagon broken into whilst at the game at Highbury against Manchester
City at which Arsenal unfortunately managed to get a late equaliser.

Some evil sod smashed in my rear window to see if anything was in the
boot compartment, there wasn't and they didn't take anything, however we
had a very cold journey home as every pot hole caused more glass to fall
out.

I had the window replaced through my insurance, but the chap who
installed it scratched my paintwork with his Stanley knife and has also
managed to get glass inside the rear door / tailgate, which now rattles
every time it is opened.

To make matters worse he has fitted the glass slightly off centre,
probably only by 2-3 mm but irritating nonetheless although I do have
some sympathy with him as it was howling a gale when he fitted it last
week, it took him over 2 hours.

RAC who fitted the window have agreed to sort out the paintwork
scratches and remove the glass from the door but want 2 quotes and
unsurprisingly have said they will go with the cheapest.

I intend to get one quote from DBS Desira the useless Alfa dealer I
bought the car from and would like to get another one from someone who
specialises in Alfa Romeo's.

Any assistance would be much appreciated.

Glen Rolland