Deffinately clay. It's about 2" internal diameter, so yeah maybe somewhere about 3 to 3 1/2 external. I haven't had anything come down it but we've had no rain since I discovered it. I'm not too worried, it's headed under my house and all the wastes and Gulley's are accounted for. Like you said...
Both negative. Jammed my finger up it for want of a better description and it was mostly full of wet grey sediment. Im suspecting from a little research that it could be the rain water waste from the rear of the house as i only share the front gutter with my neighbour. The rear now goes into...
So I'm a lot of the way through a big rebuild of a 3 bedroom victorian semi. This forum has definitely proved useful for a few things so thanks everybody. Currently Im hand digging a trench down the side of the house to the pavement for a new poly water main. Going down to 750mm like a good...