I came across this site : www.bikedecals.co.uk/

they specialise in a range of decals, and I have ordered the ripping union jack flag.
hope this is of interest.

EFI Speedmaster, Stainless Ride Slash Cut Silencers. Fly Screen. Oil Temp gauge. Crystal clear headlight. Drilled stem Oval Mirrors. Short Sissy Bar & Rack.