House with 15m underground tunnels for sale for 300k

A house in Reading, UK, with 15m of underground tunnels is being sold for £300,000. The property has a large garden and a 'loft conversion' that has been used as a bedroom and study. The tunnels were built in the 1930s and feature brick-lined walls and concrete ceilings. The owner, who spent £250,000 on the property, is selling it as they have moved to a different location. The property is being sold through a local estate agent.