There isn't a single house or flat (for any price whatsoever) within 4 hour by train radius from Liverpool St that compares to a three bedroom in Barcelona.
Well sure, the selection of tapas in England is rather limited, it's colder and rains more, the local football teams aren't as good and you have to speak English all the time because Catalan and Spanish aren't very widely understood. But if you can't beat Barcelona for living, you'd probably want to work there too. You can definitely get similar space for your money to the Barcelona flat highlighted in the blog post in a perfectly adequate dormitory town a short commute from Liverpool Street, if Southeast England is more your thing.
Why would you live in Central London? You can commute for an hour into Liverpool St and get much cheaper rents.