Hmmm, that's what I thought (altho I have no prior experience of this, so thank you for your reply).
We clearly need to do a bit more investigation before exchanging contracts so I'll phone Southern Water first thing Monday.
Hi all,
My colleague recommended this site as being a good source of help, so here goes!
We're at the point of exchanging contracts on a house which we plan to extend.
However the drainage search has shown that a public sewer runs up the drive, under the car port and through the back garden...