Lake fell out with the IOM, hence the base closure a couple of years ago. There is only one aircraft left in the 41 fleet with the steep approach mod installed, the other 2 which had the mod were sold a while back. There is a big crew training cost to restarting LCY ops as well.
I doubt they would put a saab on it, they are to busy doing scatsta and other things to set up a one aircraft remote base. 50 seater ops into LCY are getting uneconomic whcih is probably why Arran pulled out?