Hello. Can you please set out the wording of the lease clause in question please?
Many thanks. I'm afraid there's not much you can do about this as covenants in leases will generally always be enforceable. There doesn't seem to be any conditionality to the Covenant and such covenants do prevent use for holiday lets. You could possibly have the Covenant modified or even released if the lease is over 25 years old and has over 40 years left to run, but this means going to a Properly Tribunal to decide. You'd have to argue that the Covenant is no longer of any benefit but I think you'd struggle if the other flats are private residences. I'm afraid it seems you may not be able to proceed. Sorry!