Who pays to preserve shared ecclesiastical heritage?

On the walls of a ruined church in Northern Spain are some very fragile paintings depicting the murder of Thomas Becket. Now in the ownership of the local authority, they represent an exceptionally rare example of medieval art. Unfortunately, the local council doesn't have the resources to properly conserve the paintings and so the usual shout has gone out 'we need more tourism' so that they can raise the income to stabilise the ruins and employ proper conservators. Becket is a member of the Canon of Saints of the Catholic Church and as a former Archbishop of Canterbury, is also venerated within the Anglican church. So should there be financial support for the town of Soria from these bodies. How can we support one of the poorest Provinces in Spain to protect and then benefit from these unique works of art?

http://news.bbc.co.uk/1/hi/world/europe/8029320.stm