 Many of the family 's extensive collection of paintings , most sourced from Spain by William , were donated to the Trust . In part this was due to their poor condition , which involved not just water but also ironically guano damage . The most important painting in the collection is the 17th @-@ century work by Zambrano of St Lawrence , which hangs in the middle of one of the walls of the hall . It was cleaned and repaired by local art conservators Bush and Berry , who are based in a chapel William Gibbs built in the village of Flax Bourton . In 2011 the Trust bought the painting The Mater Dolorosa ( Mother of Sorrows ) by Bartolomé Esteban Murillo at Christie 's auction in New York , which had hung at Tyntesfield since William purchased it until some time after 1910 . 
