Works undertaken included removal of Westmorland slate and Welsh slate coverings, removal of failed fixings and battens, repair and treatment of decayed and infested timber work, formation of new treated counter and tiling batten structure with breather membranes, re-laying of the salvaged existing and recovered Westmorland slates and renewal of lead gutters and flashings.

Due to the building being of historic value, the Westmorland slate was salvaged for reuse. The slate was in good condition, but as with all roof refurbishments it was not possible to save them all. Twelve tons of Westmorland slate from Cumbria was brought in which were matched in colour, thickness and texture. The slate had all come from one building that had been demolished, so there was continuity throughout. The reclaimed slate was mixed within the original slate covering and then laid to diminishing courses.