You misquote me, it was "in service in England" with the 4th FG in late '42 and later the 56th FG, around the same time that the earliest model F6F, the -3 was delivered incidentally. First combat contact for the P-47 was in March '43. See the below statistics:
Model Ser.Del #Built
P-47B Mar-42 170
P-47C Sep-42 60
P-47D1-24 Feb-43 6,300
P-47D 25 Sep-43 6,290 also pre '44 which would put it in MW