All single seat Typhoons in service with the RAF are FGR4 variants. Despite a range of different standards e.g Tranche 1/2.
The F(ighter) G(round attack) and R(econnaissance)- FGR4 comes from the increased capability the jet has received as it has been upgraded. The original being the F2 carrying the F(ighter) designation for it only possesed an Air to Air capability at that time.
Cheers,
Mr Vice.