Strange flight ident number!.

[alanalgy]

Yesterday 20/04/21 I observed a great amount of flight activity around Shawbury RAF helicopter training base in Shropshire where each fixed wing airliner icon had a helicopter icon superimposed over it and a strange (well to me anyway) flight identification number over each icon eg. SPCTR01, any information would be most helpful, thank you!.

[Oblivian]

Short for spectre
google finds RAF callsigns.. SPECTRE Griffin HT1. RAF Shawbury.

https://en.m.wikipedia.org/wiki/Defence_Helicopter_Flying_School

[alanalgy]

Thank You for your prompt reply Oblivian, much appreciated. Alan.