Rob,
There are two sets of Studio27 decals. The smaller set which I bought is just an upgrade kit, to amend the missing Silk Cut labels. The larger one, I believe, is a complete set.
If building the kit again I would certainly choose to go for the complete Studio27 kit, as both the quality and the purple colour match were slightly better.
Another thing I did, which I would recommend, was paint the cockpit roof in TS-37, rather than use the decal. There are some details there, such as the upper door hinge and the aerial mount, which would probably be quite hidden by decals. That is unless decal solvent would cure that.
Still looking superb, by the way.