Looking at buying XT brakes from rosebikes only thing putting me off is the levers are wrong way round. How easy is it to change these round

Very Easy

You will probably need to shorten the hoses anyway and thats when you swap them over. You will need a new olive and insert( http://www.merlincycles.com/bike-shop/mtb-parts/brakes/disc-brake-spares/shimano-disc-brake-spares/shimano-hose-olive-and-insert.html )for each one but they are usually supplied with new brakes from shimano anyway.

Buy the bucket thing for bleeding them too. Screws into the lever and makes the bleeding easy

My brakes from Rose came with spare olives and inserts BTW

You will probably need to shorten the hoses anyway and thats when you swap them over. You will need a new olive and insert( http://www.merlincycles.com/bike-shop/mtb-parts/brakes/disc-brake-spares/shimano-disc-brake-spares/shimano-hose-olive-and-insert.html )for each one but they are usually supplied with new brakes from shimano anyway.

FYI that insert (the gold coloured one) is the wrong one for Shimano’s 2012 brakes. They use BH90 hose which has a smaller ID and therefore a different (silver coloured) insert. But as pointed out – the right ones will come with a new brakeset anyway.

PS: The oloves are the same as the old and new hose has same OD.