Sussex police have/had an unmarked Fireblade, ridden by someone in all black leathers, wearing a Sam Browne belt and a plain white helmet. So, not obviously looking like someone who should be riding a Pan European
Been stared at by police in various European countries. In France I've had a few "slow down mate" waves and in Spain I've had "go on mate give it some" type hand gestures (well that's how I interpretted them).