Just for Paul and anyone who's interested, here's a link to the road.cc article on a review of the UCI rules on rider equipment and position: http://road.cc/content/news/55389-uci-technical-regulations-update-socks-helmets-and-hydration-packs-all-come-under
And here's the actual document:
http://road.cc/sites/default/files/UCI%20check%20of%20the%20equipment%20and%20position%20in%20competition,%20March%202012.pdf
And here's the actual document:
http://road.cc/sites/default/files/UCI%20check%20of%20the%20equipment%20and%20position%20in%20competition,%20March%202012.pdf