I think I must have been luckier than the chap in the Cessna. I was chugging along in my Airtourer at the regulation 100kts,up from a farm strip near Royston heading towards Nuthampstead,when doing my scan like a good boy, I was aware of something closing up on my starboard wing. This pretty quickly manifested itself as an A-10 and was close enough for me to see the pilot waving and pointing to my left. Hello I thought, have I been intercpted. In fact he was pointing out his wingman so I was effectively the lead in a 3-ship. I've never flown so accurately before or since and after 30 seconds or so they pulled up and headed North, presumably to Alconbury. Dined out on that for a while.