If you want to buy as close as possible to London, need at least 2-bedrooms and have a median household income without too much saving, then you're literally commuting in from Wales.
Yes, the season ticket works out to £800 a month, but I'd be paying multiples of that each month for my house in London. Commute is 1h15m door to door, and the majority of that is on the high speed train from Rugby to Euston where I can either get work done, or read/listen to a podcast.