Good evening Mr Auburn, maybe we could discuss here to see if there's an easy fix, and defer to the forum if not?

building=ship; tourism=attraction; added 17 years ago(!); just the ship:
https://www.openstreetmap.org/way/5006061

tourism=museum; added 3 years ago; also overlaps pier :
https://www.openstreetmap.org/way/995843297

the ship, per wikipedia, was launched / first set sail in 1938, which the museum way incorrectly suggests is the year museum started (start_date=1938), where in fact the ship was docked and become a museum in 1978.

However, and this is where we might have fun figuring out how it should be mapped, the ship was moved to Portsmouth in 1999 and may be 'dry docked" ie moved at some point in the future (for maintenance etc). If this were to happen, then surely the ship could be moved to it's new location and disused: prefixes added to the tourism tags.

the museum way (not the building) has these as additional tags:

addr:city=London
addr:housename=The Queen’s Walk
addr:postcode=SE1 2JH
operator=Imperial War Museum
tourism=museum
wheelchair=limited

maybe these could be migrated to the ship (building way) and the museum way deleted?
