Hello Harrogate,
Apart from the Wardair schedule which operated back in the 1980's there have been an infrequent number of 747 visits including Air Atlanta operating Lourdes/football charters for LUFC supporters, and UAE(?) State 747SP bringing in a VIP for treatment at one of the Leeds hospitals.
In the summer of 1996 LBA received numerous aircraft for Euro 1996 including Corsair 747's and Aeromaritime DC10 etc.
In about 2000, I believe Corsair brought in 2 747-300's on one day to take Leeds fans to Madrid or somewhere during their European Champions League forays (How the mighty have fallen). Nowadays we get ourselves into a tizzy when an A310 or 767 comes in!