Bolas hiding place outside

I've finally found it, in a coldframe (?) next to the derelict greenhouse in my loony neighbours garden.

There's a pane of glass missing in the coldframe for him to climb thro' and it looks like there are a few plants in pots, tho' these could have been long forgotten about. I hope so anyway, if not he won't be best pleased at finding his plants have been crushed by a cat sleeping across them

Ian