Ticket pricing on the British rail network is notoriously labyrinthine. Often it’s cheaper to split a journey into two or more segments and buy separate tickets for each part than in is to purchase a through fare.
Dmitry Adamskiy has built an interactive map plotting out the cheapest advance single fares to every station in the country from several locations – London, Egham, Brighton, Birmingham, Coventry, Glasgow Central, Leeds, Liverpool and Norwich. Destinations are indicated by coloured markers. Taking their colour according to how expensive the fares are, from Green – cheap – to red most expensive. Clicking on a marker brings up the exact price.

Picking London as an example you can instantly see the madness of how travelling to central Scotland – several hundred miles distant is often cheaper than getting the short distance to counties surrounding the capital.
Read David’s notes on the map here.
via Suprageography