On the Permit vs CofA costs question, permit aeroplanes are much cheaper to maintain, not because there is less maintenance, just because you can do most of it yourself.
The LAA are in the process of allowing some types to be cleared for IFR/IMC flight. If you think you can afford it, then a Vans RV 4/6/7/8 would be the way to go as these are going to be cleared, though on a plane by plane basis(i.e. you'll need the right instruments/avionics)
An RV will cruise at 150kt and cost you about £70/80 per hour. The monthlies will vary but expect about £100-£200 per month depending on the size of the group. Most of these are also aerobatic. A 1/6 share in an RV7 will run to between £6k & £10k depending on engine hours, group funds, avionics fit, etc.
If you want to go cheaper then a Jodel group would probably be a good shout. Its a real ball ache to set up your own group, so check thoroughly for one that fits your needs nearby. Don't wait for them to advertise, just find a group member and ask if he/she knows of any current members that might be open to an offer.
A decent group will be happy for you to take the plane to Europe for a week once a year.