Sorry - I never saw your final question but better late than never?! I'm just outside London (Croydon), to the south and 40 miles from the south coast. Things have now moved on - I joined a local club and have bought several beginner planes and a couple I'm too scared to fly! You were right about the CG - an ace flyer at the club balanced the Cub with thin bands of bluetak stuck on the nose and it was just right after the 3rd band! Fairly recently I fitted a P51 motor which transformed it and, not least, I was able to remove the bluetak! I must have done something right because it flys well, climbs vertically and will loop forever!