commutefrom.com helps you decide where to buy a house around London. It tells you which stations are within your preferred commute time of the central London station nearest to your work. It also tells you information like the average house prices, crime rates, schools and deprivation in the area, and the season ticket fare.
Just click on a station for details or use the search at the top if you have a query. e.g. "from south-west to Chancery Lane station in 30-40 mins?" . Results can either be viewed on the map or in a table. If you're just browsing, explore the map by clicking and dragging. More advice in About.