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I forgot scaffold. Your guys must have spent £400k on scaffold.
lol, nah. Loads more extra costs than just the scaffolding. Removal of huge 1920s lead water tanks, re-routing of piping, re routing of electrics, replacement cabling for antennas etc. Structural strengthening. Rot removal/treatment. New lead flashing, replacement of render band around the top. More I've forgotten about. Its an old and complicated building.
We ( 1/70 share of freehold) spent £600k on a roof replacement that was slightly less than a third of an acre about 7 years ago.
*Conservation area and world heritage site restrictions though so ymmv