Richard Pelter from International Fine Art Conservation Studios removing the Barry paintings entitled 'The Progress of Human Knowledge and Culture' from the wall of the Great Room. The rolled up painting shows the artist himself. Photographer Richard Olivier

Photographer Richard Olivier

Photographer Denzil McNeelance

Photographer Denzil McNeelance

Photographer Denzil McNeelance

Photographer Denzil McNeelance

First painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Third painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Third painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Fourth painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Fifth painting in the series entitled 'The Progress of Human Knowledge and Culture' by James Barry, 1777-1783. Photograph by Geremy Butler

Damage to the top of 'Bolton' column on Great Room landing, caused by glass doors swinging back onto column

Crack on North West corner of Great Room landing

Benjamin Franklin room, light fitting recessed under Great Room floor

Original brickwork

Floor structure