Pleased to report that all is still working well, emptied a small amount from bucket twice, so reckon a full bucket would be a weeks worth. I'll sort it all out properly when it won't freeze my nuts off to do so. I'll jet clean the external pipe, put decent lagging on it, use more than a couple of cable ties and correct the fall. Then I'll reconnect internally with sleeve and glue, an easy job but not in bitter cold and strong winds.
I can echo all the sentiments on here, stupid as I think my condensing pipe routing is, it still should have done the job if fitted correctly. As I said earlier they got the increase in pipe size externally to accommodate the lengthy run right, and that was it. The lagging is laughable and the fall non existent in places, plus the right angles. If I'd never installed one, as I haven't, there is no way what they have done would have been my first effort. I would have assumed maximising fall, no flat right angles, decent lagging and maybe even boxing to protect against wind chill.
That's how this, reasonable DIYer with a modicum of common sense, would have tackled it. Why the 'professionals' made such a piss poor job I can only wonder in annoyance.
