The friends we were visiting in Lancashire last year took us to Blackpool. We went on a tram trip (all the way to Fleetwood) and on the way passed these daleks, and a TARDIS; part of the Illuminations. Photo is a bit blurred due to being taken through the tram window:-

According to this post from The Daily Galaxy, time travel is mathematically possible.

Not by a time machine as such but in “a bubble of space-time geometry which carries its contents backward and forwards through space and time as it tours a large circular path.”

Ben Tippett from the University of British Columbia has created a formula that describes the method. Unfortunately that formula the does not figure in the post. The method also requires bending of space-time by exotic matter – which hasn’t been discovered yet/ Might as well be Science Fiction.

The bubble is described as a Traversable Acausal Retrograde Domain in Space-time. The acronym spells TARDIS. Ha very ha.