I went back there a few days ago. I hoped to bump into the resident apiarist, Julie Kendle, but failed, although I had a chat with a couple of gardeners in the tropical dome who tell me the Top Bar Hive is to go, sensibly enough, in the African section.
I had a closer look at the hives on show near the car park. There are three on a stand that appears to be probably mouseproof but a little narrow so may be a somewhat precarious if the wind blows. They are side by side facing the same direction and so might be at risk of drifting, however the middle one is painted white and so that may be a good enough marker to reduce that problem. I didn’t see any bees flying in the cool of the evening so maybe those hives are just for show anyway.
I was intrigued that they seem to be a National, a 14″ x 12″ and a Commercial. Julie may be in for an interesting time if/when she tries to combine them or make up nuclei.