Thatching is one of Britain's greatest arts. Using thatch for roofing goes back as far as the Bronze Age and a drive through any rural area such as Dunster in Somerset and Great Tew in Oxfordshire will reveal a great number of thatched cottages that wouldn't look out of place centuries ago.
Roofs are sealed from the outside. So if you have a birds nest in there, there’s been a failure in the materials somewhere for birds to get in and nest.
Roof leaks are tough to diagnose and they can cost thousands to repair. If you have a roof leak, it may not be as bad as you think though. Most roofs that leak do so because they have worn out or have been damaged over time.