Heathrow - strange place for a piano!?

We hav just arrived in the UK for Christmas. Left home at 0700 this morning and we arrived at my sister in law's about midnight (our time) about 2100 local. So very tired.

The photo is of a piano that was in Heathrow's transit corridor from the plane to luggage collection. We then saw two more pianos further on. One was a baby grand which was playing itself! (Took some video of it). Looked quite bizarre. Quite "Harry Potterish"! Further on there was another piano so there must be some theme going on but we weren't sure of the relevance.