Yonks ago, I was RHS in a PAZT from Luton to Liverpool. Just nort of LIC @3500 I saw a very bright light waverimg between my 11-12 o'clock. After 15-20 seconds, said light went from 12 o'clock to my left, and vanished in less than 5 secs.
Convesation...
Me .......... few secs later
P1 "Errm, can you see what I see?"
Me "That bright light?"
P1 "Yep, I thought that I was seeing things"
At this point, the light/object went left.
Me "It's probably the landing lights on an inbound into Manch or Liverpool"
P1 "OK"
Subsequent checks revealed no a/c inbound to either a/f +/- 45 mins of said sighting
watp,iktch