thanks all in the end i brought this http://ukpetsonline.com/detail.aspx?ID=427
they luvvv it it gives them so much more room to play and they both fit inside to snuggle on an evening....i was leaving the bunnies to have 24/7 access to there run but last night hubby caught 2 large foxes in the garden having a nose at my babies so even thought i dont think they'd get in i am shutting them up from now on just to be safe