Fly spray?

we have seen a number of different fly sprays to protect against fly strike...

have seen some which require weekly applications but Beaphar do one thats up to 3 months at about £10 (which will last 2 applications, so will last upto 6 months for us)

they will have a good diet, so im not too worried, but would like to get some just to make sure

could someone please advise... Thank you

The best I have found is the hutch snuggle it comes with a netting that goes over the front so they can not get it at all, it also regulates the temperature of the hutch. The other thing I do is put a HUGE citronella candle near the hutch, obviously up high if they are out and this is fab, say good bye to wasps.
The best deterrent of all is to keep the hutch clean I put LOADS of broadsheet paper down and lift up one layer + all contents each morning then new sawdust and a some hay.

i have no problems with flies.just keep your hutch clean, I do mine daily.