This telephone is part of a collection of old phones at the Milton Keynes Museum. In fact the collection has its own website.
Excitingly, the above phone is housed in a blue police phone box just like the Tardis, but unfortunately the same size inside and out.
The grandchildren had fun playing with the phones, it’s a very hands on place with helpful volunteers to explain how to use them. Made me feel old that they didn’t know how dials work!