I just received my first RC plane today! It's one of these.
The Clouds Fly or AXN Floater Jet
£45 shipped (from Hobby King's German warehouse), plus about £20 worth (from Hobby King's hong kong warehouse) of electronics. I already have radio gear and batteries as I'm a fairly seasoned RC helicopter pilot and use a DX8 radio and have a spare receiver.
Unfortunately, Hobby King were out of stock for the kit until yesterday, so I'd already ordered one and paid £90 for the same thing including lesser electronics from a UK company, who took 4 days to post the thing. I still have the electronics on order, so I can swap them out when they arrive.
I'd recommend a computer radio for any radio controlled flight, so if you can't stretch to at least a DX6i or equivalent, I'd honestly go for the Turnigy 9X/flysky radio, even if it's just a temporary thing until you get hooked and are willing to spend a bit more. You really need a computer radio for things like elevons, flaperons and v-tails, not to mention any mixes you might want to set up.
As for park flying, then you need to read your local byelaws. In Sheffield, there is no prohibition on electric flight in any of the parks, just fuel, jet or rocket powered is restricted to about 6 sites. But then again, the rules were last updated in the 1960s, so that stands to reason. I believe you're also allowed to fly on "common land", whatever that means. I'll certainly be flying this plane in my local park, because the wings aren't removable (unless you modify it), which makes it too big to transport along with my helis.
BMFA insurance is a good idea, and so is joining a club. Honestly, I find the banter down the club as enjoyable as the flying.