Hi Skyclamp,
Excel have 5 B737-800s, two based at MAN and three at Gatwick. Going by what I was told there are very few night stops but you do get night charters to fly. Roster is fairly stable, you get one every two weeks and you don't get many changes.
There are rumours that if the industry picks up Excel will get other aircraft. In airliner world a couple of months ago it was mentioned that they'll be basing a B737 at Bristol.
On the whole it's a small airline without ambitions of operating 30+ airplanes in the next couple of years. I reckon it could be more secure than other airlines.