Media playback is unsupported on your device

Disused fort on River Thames up for sale

13 August 2014 Last updated at 14:17 BST

A seven-bedroom mansion, with sea views and in commuting distance of central London, is on the market for £500,000.

This might sound like a bargain, but there are a few drawbacks.

You can only get to No 1 The Thames when the tide is low or if you have a boat as it is situated in the Thames Estuary.

BBC London's Gareth Furby took a tour with estate agent Nigel Day and spoke to its current owner Simon Cooper, from Eltham, south-east London.

Most watched

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.