Yep. One of very few such turntables ever used in the
UK▸ . It's believed that this one in Christchurch is the last surviving one. It's now in the courtyard of a gated retail/residential development so you can't get to it. I photographed it through a security gate. A resident was exiting said gate when I was there and I asked if I could pop through and quickly take a few close up pictures. Sadly that request was refused. The turntable was listed in 1976 which explains why subsequent development has surrounded it, with it remaining in situ.
https://historicengland.org.uk/listing/the-list/list-entry/1153371I had visited the location some years ago to photograph it but on that occasion there was building work going on and the courtyard was hidden behind hoardings.
If you want to watch the turntable in action then there are a few videos on YouTube taken from old cine footage. One such video, including a great deal of footage of the Bournemouth Corporation Trolleybuses, is this:
https://youtu.be/Dt82dt2X-noThe turntable can first be seen around the 3m40s mark.
Also, an ITV Meridian news report from the mid 2000s:
https://youtu.be/-n6qfSHpUNg