Thanks for all the useful info.
Decided to purchase some
ACS springs in the end and had fitted by
Mulgari in Bracknell. They're just in the process of moving premises at the moment but really helpful, friendly and most importantly did a good job of installing.
Really happy with the lowering, nice and even and get pretty much bang on the 2cm all round lowering. Ride is pretty much stock for the most part but feels more planted when pushing on, my wife didn't notice the difference.
BEFORE
AFTER
BEFORE measurements:
Passenger front - 37cm
Passenger rear - 37cm
Driver front - 37.3cm
Driver rear - 36cm
AFTER measurements:
Passenger front - 35cm
Passenger rear - 35cm
Driver front - 35cm
Driver rear - 34.5m
Total LOWERING:
Passenger front - 2cm
Passenger rear - 2cm
Driver front - 2.3cm
Driver rear - 2.5cm