"You've got some of it on your hands and you didn't tell us anything about it. It was very wrong of you, wasn't it?"

The Doctor makes Barbara feel small with a little ticking off. Fair enough though - she had almost died from the stiffest of upper lips (and a dangerously unbathed ankle).

Eco-whistleblower Arnold Farrow fares even worse with a slug in the chest and a ruined holiday, while his murderer - Mr (D?) Forester - escapes with a burnt aerosol and a bloody nose. But the bloody nosey Hilda and PC Bert save the day.

Ian has a knees-up in a matchbox, Susan shins up a drainpipe and the Doctor's spirits sink in a basin as the regular cast prove there are no small roles, just small actors.

So did Jim and Martin find that good things come in small packages or that size really does matter?

Listen to find out.