There are the odd "no capital" groups around if you hunt for them as well. You tend to pay a small fee of a few hundred quid to get in, do a checkride and then hire when you need at greatly reduced rates compared to the standard club fare. These groups usually come about as the owner is looking to cover his fixed costs. I know a mate that got into something at Blackbushe that had a couple of archers for rent. I think it is a case of knocking on doors though as they don't seem to get advertised at all from what I can see.
Another option is joining an existing group on a PFA aircraft where the shares are usually much cheaper - say £1-2k and running costs low.
Then there is that well trodden path over the Atlantic. Great for doing bulk hours in a short timescale.
I would tend to stay away from setting up your own group unless you are in it for the long term. Shares take a long time to sell and you will invariably get left having to meet the ongoing costs whilst trying to get out of a group and not being able to fly the thing to boot. There are a load of threads on groups and PFA stuff over in the private flying forum.