Thank you for that feedback.

I wonder how I could find out whether that drain is a problem.

Our concern is not just about flooding actually taking place but also how insurance companies classify the flood risk both now and down the line as the current data shows this property to be at highest possible risk classification.

Not clear why it is classed at such high risk of flooding from rainwater if not due to that drain. Unless of course there is a history of flood damage we just don't know about.

Utter nightmare!