Big enough ?

My bunnys live in a 6 by 4 ft shed witha 6 by 3 ft run attatched x they have permanant access to the run. plus a daily run of the garden which id huge. Is this suitable for a medium sized bunny and a small netherland cross

I'd say yes, since they have permanent access and daily exercise. Ideally the run should be at least 6 foot or even nearer 8 foot to let them have a proper run, but your setup certainly isn't cruel and it's probably far better than most!

that 6 by 3 run i got given by my neighbour