Given how intriguing the plot of The Invasion of Time is, with all its twists and turns, it is a crying shame that once again the production is a bit of a mess. The silvery tin foil monsters with the voices of preppy sixth formers make it impossible to take them seriously as a threat. I’ve never had consistent issues with Doctor Who’s production until season 15, but this series a lot of design and directorial choices have missed the mark and waster brilliant scripts and acting.

It’s Overlong. By part 5 it turns into a studio bound action adventure that I think could only be done justice by the new series’ budget. I actually rather enjoyed part 6 in many ways though, despite it being quintessential runaround by this point in the lesser seen, rather unconvincing quarters of the TARDIS.

Although Leela has the classic “I've suddenly found a man” send off, both she and the love interest play the scene convincingly - it’s touching. I will miss her. There’s a nice misdirect with the K-9 farewell… I do hope he is less noisy in season 16!