QTV was the old code for Venice Treviso.
Outside EMA, BHX, MAN and LGW 1985 had Orion flying:
BOH to MAH, FAO, CFU and PMI
STN to CFU
CWL to MAH, FAO
LBA to MAH, LEI, FAO, CFU
GLA to PMI, TFS, LEI, FAO, NAP, HER, CFU,
NCL to CFU and HER
BRS to MAH, TFS, LEI, FAO, NAP, RHO, CFU
LTN to LEI, FAO, HER, CFU
They were also doing MAN-TLV in -B1 powered 737-300...
Virtually all of the regional stuff had gone by 1988. Destinations in Greece for Horizon were RHO, CFU, HER, EFL, SKG, JSI and ZTH. For other tour operators including Owners Abroad group, they were also flying ATH, ZTH (the 733s looked like they could get back non-stop to LGW but nowhere further north, as refuelling stops at QTV were planned), JSI, PVK, JTR, EFL and SMI. Most of Grecian's flying was on the Paramount MD83s by then with Owners Abroad also using the Amber Air 737-200s at Manchester.
Looks like only Britannia and Dan-Air were serving JMK in 1988. And yes, there was a Friday night Newcastle-Athens W pattern from Gatwick on a 737-300.
Turning the clock back further, to 1982, one can't help but think that the BD9115 Alicante departure at 23:30 on a Sunday night must have been unpopular with the locals - in a 707. Nearest rival is probably the OM544 01:30 Sunday morning departure from Luton to Tel Aviv in a Boeing 720 - which I guess you could probably hear on the outskirts of Birmingham too!
But yes, I've got most of the ATUK books - missing a few along the way but have a pile of them.