How did they squeeze the Doctor into such a small package?

Incidentally, before I forget. The replacements for the Black Guardian box set arrived today. I feel obliged to mention Amazon for their sterling customer service. This is the second time I have had a problem with an item, and both times they have quickly and without hassle sorted out a replacement. Thanks to them, Zoë and I shall be watching classic Peter Davidson action in bed tonight.

1980s BBC sci-fi on a low budget, we salute you!