As far as I can see it, Club 328 should've cleaned up with the 328. It's a rare bear in Europe and unique in the UK. If managed properly, then it should've been flying all the time. However, it seems that this particular one seemed to spend most of it's time in pieces in a hangar somewhere waiting to be glued back together!
With Plane Chartering, you've not really got anything of Club 328 left (ok, the Hawker). So, what you're left with now are two Citation II's which are hardly difficult to come by in the UK (most of the ones already operational are run exceptionally well - we all know who the cowboys are) and the Hawker 800's. The Hawker's may have decent range, but how often do you need it? The Citation Excel / XLS is a much newer aircraft with a decent luggage hold, or even the Lear 45 if you don't mind crawling on your hands and knees to get to your seat - if you need the range on a budget then go for a Lear 60. To be honest, anything over 4 hours then you've got the Challenger 300's or Sovereigns now, why bother with a Hawker?
To make Plane Chartering work they're going to have to be competative price wise, offer outstanding service and be contactable out of hours (especially weekends)!