Watford Junction station tastes like sugary porridge while Chorleywood is blancmange and Northwood resembles a chewed matchstick according to the latest spin-off of the London Underground map.

The map was designed by 54-year-old systems analyst James Wannerton who tastes words when he reads or hears them due to a neurological condition called synaesthesia.

Blackpool-based Mr Wannerton first noticed the distinctive taste of tube stations when he was four and travelling to school from his home in Willesden, north west London.

Since then he has made frequent trips to London Underground stations and compiled extensive notes to help complete his "taste map" which was completed earlier this year.

Other tasty stations in south west Hertfordshire include Rickmansworth which Mr Wannerton says tastes like classic Cadbury’s chocolate Bar Six, Croxley tastes like Ovaltine, Moor Park is school dinner staple semolina, while Bushey is burnt potato and Carpenders Park is bigga marrowfat peas.

Watford’s three stations all draw inspiration from the breakfast staple with Watford met line apparently tasting of porridge and Watford High Street tasting of watery porridge.

Mr Wannerton, who is of the UK Synaesthesia Association, told the Telegraph newspaper: "This actually became a bit of an obsession - not unlike standing on breezy railway platforms collecting train numbers.

"I've often gone out of my way to travel through places such as Plaistow and Mill Hill East just to see what they taste like in situ and of course to add another to my collection.

"It is incredibly consistent. These tastes and textures never change.

"All I did was traverse the underground lines. It was very natural and involuntary; when the taste popped up I made a note of it."