J,
not sure about where in UK either, but i'd just check Toys R Us. also, try sending an email to silverlit.com - they were the ones who made the original AeroAce (the X-Twins), and they might be able to get you one since they're over seas too.
as for the Stryker, i had flown only a couple other pretty cheap, hardly flying planes before i bought and flew the stryker. i had maybe an hours worth of flight experiance before i gave the Stryker its first toss in the air. that first toss resulted in a nose-in crash, breaking the nose in about 3 places, cracking one wing and pulling the motor (with foam attatched) and electronics right out of the plane. BUT, i got some 2 part epoxy and glued it all back together. i smashed that plane so many countless times, but all it took was 2 part epoxy to fix it. i broke 3 propellors, one servo, one motor, lost one battery but it kept on flying. i finally had to retire it after a low level inverted flight went bad and completley destroyed the fuse. but, i spent 20 bucks and got a new fuse and was back in the air the next day. this was with the first generation Strykers too.
the new F-27B has a much better body, RX, and other parts. its really not a beginers plane, cause it can be very fast. but, if you get one, wait till a nice calm day, give it 3/4 throttle and give it a good hard level toss and it should fly. the stryker weighs about one pound, but it can fly very slowly and is easy to control once your used to it. but, i would advise getting at least some stick time with another plane first, as Tommy said, the aeroace is completely differant than the Stryker, but some of the basic, need-to-know principles are still there to be learned. good luck
nick