SwapShop?

At the RSA today to see the new Turner exhibition, done as a swap by Scotland with their Ireland counterparts - https://www.nationalgalleries.org/exhibition/turner-in-january-irelands-vaughan-bequest

Glad I got in there at my cunningly calculated lunchtime and got access after 10 mins, as 30 mins later the queue was a 40 minute wait. Think this chap had been there for a few years, not a muscle did he twitch!