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Crafted by the Time Lords on the planet Gallifrey, the TARDIS is a Type 40 Capsule that transports the Doctor through time and space.

It has been the one constant in the ever-changing world of Doctor Who.

In this extended clip from the 2003 documentary The Story of Doctor Who, series writer Terrance Dicks highlights the importance of the TARDIS.

The TARDIS, stuck in Police Box form due to a malfunction that the Doctor cannot fix, could have looked very different, as this document from the ³ÉÈË¿ìÊÖ Written Archives shows.

This letter dated 25 October 1963 from Assistant Controller of Television, Joanna Spicer, confirms additional funding to add to producer Verity Lambert's existing £975 allocation for the ‘provision of the special model space machine’. This took the budget for the TARDIS to £4,000, the equivalent to almost £70,000 today.

The production team were hamstrung by budget and practicalities, and in this letter dated 10 June 1963, Head of Drama Sydney Newman begs them and the writers to keep this in mind.

In this clip from a 1983 episode of Nationwide, Verity Lambert discusses not being able to afford to make the TARDIS change shape.

The budget limitations also forced the Radiophonic Workshop to think creatively when it came to sound-tracking the TARDIS, as sound engineer Dick Mills demonstrates to presenter Vera Gilbert in this episode of Nationwide broadcast on the 2 April 1979.

With the growing popularity of Doctor Who, alongside advancements in technology and bigger budgets, the TARDIS has evolved.

With a fresh lick of paint and an evocative new TARDIS soundtrack scored by composer Segun Akinola, here’s the Thirteenth Doctor reunited with her 'Ghost Monument'.