Well since you've asked I do have a tip for you :-) Might not be an exactly "British" squadron but it's certainly RAF. And don't worry about Topcat or Beaz, I'll bully them until they give in, so they won't give you any problem if you choose this one :-)
Here goes:
310th Squadron RAF (NN-)
flew (leaving out Hurri I, and IIB):
Spitfire Mk.IIA oct41/dec41
Spitfire Mk.VB nov41/mar44
Spitfire Mk.VC jul42/mar44
Spitfire HF.Mk.VI jul43/sep43
(the high altitude variant)
Spitfire LF.Mk.IXC jan44/jun44
(unoficially "Mk.IXB", e.g. Merlin66/C wing)
Spitfire LF.Mk.IXE jun44/jul44
Spitfire F.Mk.IXC jul44
(unoficially "Mk.IXA", e.g. Merlin61,63/C wing)
Spitfire Mk.VB jul44/sep44
Spitfire F.Mk.IX aug44/aug45
Spitfire LF.Mk.IXE since aug45
alternatively 312th RAF (DU-) (again leaving out Hurri Mk.I/IIB)
Spitfire Mk.IIA oct41/dec41
Spitfire Mk.IIB nov41/jan42
Spitfire Mk.VB dec41/feb42
Spitfire Mk.VC aug42/feb44
Spitfire LF.Mk.IXC jan44/jul44
(unoficially "Mk.IXB", e.g. Merlin66/C wing)
Spitfire LF.Mk.IXE jun44/jul44
Spitfire HF.Mk.IX jul44/oct44
(Merlin70,C wing high alt version)
Spitfire F.Mk.IXC oct44/aug45
Spitfire LF.Mk.IXE since aug45
either of these two squads represent almost all the Spit IX variants in production. I can provide several paint schemes for the different versions, including photos.
You asked for it

Czech 6!
Jakub
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Jakub "czech-" Uchytil
249th Squadron RAF "Gold Coast"Tangmere Wing