It’s a fact of life that even the biggest names in acting sometimes sully themselves in the murky world of advertising.

These days, it’s no surprise to see Uma Thurman flogging cars or Kate Winslet demonstrating her breathiest dramatic pauses to encourage viewers to tune into Sky Movies, but you wouldn’t expect to find them doing it as Mia Wallace or Rose DeWitt.

Therefore, it’s still a surprise, even all these years later, to see Tom Baker and Lalla Ward – at the time very much an item – sexing it up as the Doctor and Romana in copyright-defying adverts for an Australian computer company. It’s also a delight…