That's a memory from a previous life. (Before becoming light blue) I was the MHCO (Minehunting Control Officer) on HMS Kedleston at the end of 1970 when we were tasked to search for that Lightning. Had a large-ish area to search off Flamborough Head, but if the old memory serves me right we found it in about a week. Helped that the aircraft was intact on the seabed, so came up like the proverbial on the sonar screen.