Jet Share
I am leaving a jet syndicate this month and can honestlyt say hand on my heart that it really is the reason why you gain your PPL in the first place!
Jet operations have a somewhat different approach than the piston engine counterparts and really allows you to take on the next chapter of your flying. Sure the fuel cost is quite high but you can always drag some buddy or another group member with and split the cost (50% flying 50% watch the scenery).
These syndicates are also very well run, administered and managed and the CAA really do keep an eye on them too so you know you're in the right group of aviators. There is alot to learn but one thing that you'll miss is probably the silly wannabe and pedantic attitude of instructors that you experienced at the local flying school who thought a cessna 152 has to be operated as a 767. That kind of thing gives way to real flying ability and very practical skills in a jet syndicate and yes you will be pushed to high standard.
The actual operation of a Jet is best done by a sole individual as the CAA expect you to act as an almost full maintenance company and are quite stringent on things.
Hope that helps.