I'm starting to play around with the idea of upgrading my wife's bike to either 105 or Ultegra. All the online retailers I find do not seem to offer these groupsets with 165mm cranks. My wife has short legs and finds this length comfortable so I've been on a quest to locate someone who sells this configuration. I'd also like to keep the cost down as much as possible i.e. UK retailers.

I'll take all the help I can get and/or suggestions. I'm starting to think I need to buy the shorter cranks separately and then put the longer cranks up on the Bay or Craigs to recoup some of the cost.