Any question answered...

You sure the worms haven't done it and escaped?

Deffo outside in job

It was me.

Bastard!

maybe somewhere to burrow rather than for food? i bet its toasty warm in there.
i reckon rats or mice.

I was wondering that but not much space inside (oh and there is a nicer shed next door)

Rat for definite.

Beginning to think that (based on size).

Thanks all!