Rats and mice can also gain access to your house from wall spaces, via attics etc. Check doors, and any gaps where service pipes enter the walls etc.
Keep overhanging trees are kept cut back. Critters can use these branches to gain access to the roof. Also, branches rubbing off the thatch can cause damage to the netting or thatch, which can then be used as an access point for pests.
Rodents won’t go into properly set water reed because there’s nothing in there to interest them but they are attracted to holes, so regular maintenance is advisable.
You should always seek the advice from a professional Thatcher if you spot any problems or damage to the thatch.
Never climb onto the roof or put ladders directly on the thatch as this can cause more damage to the thatched roof.