Which Groupset?

I actually did it (I work round the corner from a big Evans shop); Veloce on a bianchi; Ultegra 6800 on a Cannondale Supersix and Sram red on that Evo ^^

Evans will let you order and test ANYTHING in any size. Apart from all the criticism that they (and other chain shops) get this is actually a good thing. I think its also because they themselves dont know the difference most of the time.

When I was keen to try on two different sizes of some shoes, they were happy to order them both for me. If I paid for both pairs in full up front. I don't have the kind of cash necessary to try several high end road bikes if that's how they do it :-/