Bendor and Jacky visit Swansea Museum to look for lost masterpieces.

Haddo House in Aberdeenshire may house some of Scotland's greatest lost paintings.

Works by Flemish artist Peter Breughel the Younger at the Ulster Museum; Northern Ireland Assembly at Stormont in Belfast.

Technical difficulties frustrate Bendor's attempt to uncover who painted an unfinished portrait in Glasgow Museum; Emma reveals the true identity of the sitter after 300 years.

Along with a hippo skeleton, a stuffed hedgehog and a log boat, Derby Museum has the best collection of Joseph Wright of Derby paintings in the world.

The building that houses the Carmarthenshire County Museum, the site where the Bible was first translated into Welsh, may be home to cases of mistaken identity and two lost paintings.