"Richard Sterry" http://www.sterry.org.uk/temp/what_ate_my_shed.jpg

Actually, I know the answer, and was initially very surprised when I
caught
the culprit(s) in the very act of vandalising my beloved shed. Anyone care
to guess what was responsible, before I ask how to discourage them? Humans
are not involved

Wasps making pulp to build with.
they like sheds and conservatories =)

Morgan