Christmas greenhouse

I don't actually know what this is, or what it's there for - spotted it on the Barbican highwalk yesterday and thought it'd make a good shot for today.  Char came with me, as we were walking to Bank together.  Poor Char's holiday to Portugal tomorrow has been very up in the air all day (no pun intended), with the major shutdown at Gatwick, thanks to some idiots flying drones around the airport.

Went for Christmas drinks with my team at lunch - a useful dose of hair of the dog, thanks to the neighbourhood-watch-induced hangover I had today.