On 01/10/2020 14:40, Peter Johnson wrote:
On Thu, 1 Oct 2020 13:54:02 +0100, R D S wrote:

https://drive.google.com/file/d/15T9...ew?usp=sharing

The recently added upstairs loo at work is attached to a run of soil
pipe approx 7 foot long and almost horizontal.


A recently built house extension near me has one like that. I
speculate on the likelihood of it being blocked every time I pass it.


I saw one where the 'horizontal' section was unsupported in the
middle and the heat of the sun had made it sag !