Just thought i'd mention it incase anyone else is planning to visit Longleat in the near future with a little Postman Pat fan.
Don't make the same mistake as i did & tell your dc's you are going to see postman pat! Ds was very disappointed :-(
Apparently its closed for refurbishment to coincide with a new Postman Pat film coming out later this year. No mention of when it would reopen.
However, don't let it put you off going....it didn't detract from the rest of our trip which was fantastic.