A popular trope among Christmas Doctor Who stories seems to be the 'Christmas every day'. The Crackers is another of those stories where characters are trapped in a loop where it is eternally Christmas and the Doctor comes along to break the loop and return them to reality.

The twist in this example is that the house the family are trapped in, constantly repeating Christmas day, is inside the TARDIS and a result of the TARDIS itself trying to protect the family from a breach into the time vortex itself (which the father of the family apparently managed to rent in a TARDIS wall using an axe - which I'm not sure says much for Time Lord technology).

This story features the 6th Doctor and Evelyn and Evelyn gets sucked into the loop becoming 'Auntie Evelyn' in the process. The TARDIS team are written well but, again, this story is from the guest cast's point of view. I understand why authors do this in short stories but it does become a bit tiresome as there are only so many ways you can write 'who is this odd man with his lady companion that have entered my life?'.

Not bad but a bit derivative.