In the ruined Church of St Ninian on St Ninian's Isle. (Shetland)
In Britain's most northerly museum on Isle of Unst - Curator warned me there was about to be a coach party in (as if I cared).
On ferries on English Channel and North Sea.
Numerous church occasions (not the only BFer in our congregation). Also in Greifswald Cathedral, Germany, during a Bach Cantata.
Restaurant at the Musee d'Orsay. Paris Metro, Gare du Nord, Eurostar.
Trains, buses, stations and tubes lots and lots. Have also done the stand outside the car and BF a sleepy child in carseat.
Natural History Museum on a Bank Holiday - member of staff asked if I'd prefer to go somewhere more comfortable but I stayed sat on the floor because DS was terrified of the stuffed animals.
Post Office queue in a sling.
While playing Crazy Golf.