LIFE!! Hurrah! I’ve finally found life in this forlorn place! Two sleepy Noctuid moth caterpillars. I asked on Twitter and @bugmanjones got back to me.... He suggested that 'as these are large and plump they may be one of the yellow underwing species'. I’ve re-located then to a patch that I have already cleared of broken glass and debris, but where they’ll still have some vegetation cover.