Quite a few of team sky/team gb is from the same youth club in wales, Wiggins started as a track cyclist and froome never lived in the U.K. The yates' started cycling - according to Wikipedia - as a result of their dad getting HIT by a car. So a lot of the great UK cyclists have their roots in track - which was heavily supported (£££) before the 2012 olympics and served as the foundation for further investment by team sky - the richest team in cycling. GB's success in cycling defo doesn't correlate with cycleability of her roads.