After 48 hours of failing to get handymen to answer my calls, the case of the stolen drainpipe is solved. Or at least being thorughly investigated. On the Sunday, looking at the remaining guttering, I realised that not only did the pipe serve my gutter, it also served that of two of my neighbours (both slightly uphill of me). So this evening, after the failure of any handymen to call me back, I spoke to the immediate neighbours and - as they'd noticed I'd had it repaired last winter when the lowest 2' went missing - they've said that they'll take care of it. So that's one thing off my to do list.