The Wallace Collection.
If you're in London and you like weapons and armour this place is worth a visit, its free (donations), very central -
MAP and one of the biggest collections in the world and not many people go as they all go to the larger museums.
It was bequeathed to the British nation by Lady Wallace, Sir Richard’s widow, in 1897. The Wallace Collection is displayed at Hertford House, formerly the principal London residence of the marquesses of Hertford and Sir Richard Wallace.
https://www.wallacecollection.org/explore/collection/arms-and-armour/