Yes, the Messenger did serve in the RAF and briefly there were twenty one in the serial range RH368-378 and RH420-429.
Credit to Owen Thetford "Aircraft of the RAF sine 1918".
I could find no trace of squadron service in A/B serials and most were allocated to Comms Sqns/flts although one is shown as being at an EFTS and another at A&AEE
Colin Cummings
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