i'd ask to make sure they are removing the rear door windows to tint them and not doing them in situ.
Didn't have mine removed and I think it was £110 or something for the 3 back windows on my 3dr. Looks ace IMO.
it's here
DB Tints | Window Tinting in Northamptonshire, Kettering, Corby and Wellingborough
near kettering i thought it sounded a good price too[iv had a car done by them
i didnt have it done the pre owner did and they look the part
no bubbles etc
Thats because the rear windows on a 3dr are all bonded and can't be removed that easily
OP was asking about a sportback that has 5 rear windows!
Was referring to the price mate, seems about right.