One reason for this lack of mapping is due to the Water and Sewerage companies taking on the ownership of most private sewers, lateral drains and pumping stations. These were transferred into their ownership on the 01/10/2011, pumping stations changed ownership 01/10/2016.

I thought this as well.

Is it not possible to put in a claim against the council?

This is the approach I’m taking , upgrade the basics like insultation first before making the jump.

Sadly I hadn’t considered that. 😔. Still, isn’t now an opportunity as well?

Isn’t this the moment to make a proper break from fossil fuel?

We have them in the UK as well. Makes a very useful fire escape.