Hi Guys,
Thanks for all responses,
I've got some additional information, I spoke to the Surveyor and asked his a number or questions, in particular i asked him to explain the problem.
Here's what he said in summary.
The Drainage runs from the back of the house to the back of the boundary wall (This is were the man hole is located), He siad this was unusual as its typically at the front of the property running out into the main road.
His concern is the location of the man hole. He was unable to inspect it and determine were it runs from the back of the property. Its possible that it runs straight from the back of the property up to the main road or it would run down through a number of neighboring back gardens, This is were his concern is, If it runs through a number of other peoples property it could cause issues in the long term, if someone was to accidentialy dig it up or damage it it could cost a lot of money to repair.
He also mentioned if it runs through back gardens, who owns it or who is responsible for it.
Here is were I'm at:
I'm unsure if this is an issue, The house was built around 1985 ish... so its been there a long time and there does not seem to be any issues todate.
The neighboring houses are also built around the same time and people are settled.
I'm not sure what a CCTV inspection will tell me, or if it will change my current position on the property, other than costing between 300 and 400 yo yos,
Any advise anyone can give is really appreciated... As mentioned before were due to sign on monday morning.
I do plan to ring the estate agent and ask him if he or the vendors know were the drainage runs and make it knowing as a concern, But other than that I'm not sure what else i can do.
Thanks