Here's a few additional UK airlines...
Mediterranean Express - Luton based, didn't last too long, and only got one aircraft operational - had hoped to fly from Berlin in 1988 , but didn't last long enough to get started
Air Manchester - barely operated a handful of flights and the aircraft was handed over to BAF
London European / Ryanair Europe - Luton based, operated five 1-11s at one point.
There are plenty more operators out there...
TCU... you beat me to it for Air Manchester! Think this was the first 1-11 that BAF operated?