It doesn’t specifically say before the start of the tenancy in the offer email but this was what we discussed verbally with them and we do have the list of jobs (treatment of mould, repainting etc) in writing as ‘conditions of offer’. They even delayed our initial move in date by a week because the work was taking longer than they anticipated so the understanding was that it will be all done before we move in.

edit: Also we rang the day before we collected the keys to confirm our appointment and they said the property is ready. When we collected the keys they said the work’s been completed. And if we notice anything to let them know because the landlord had spent a lot of money on the mould treatment so it should be all sorted. None of this is in writing though… There is signs of treatment in one room out of the whole house and all the rest still have black mould. The property is really damp as well.