Im not in the UK, and I don't go to work any more, but DH still does. When we got married seven years ago, we did exactly this. We sold both of our houses and bought one that's 3.5 blocks from his work. It was about $200k more than we had hoped to pay, but it has been totally worth it. DH walks to work every day. We are in a desirable school district, which is irrelevant for us, but is good for resale.
The reason it's been "worth it", besides the fact that the house is lovely, is appreciation. The demand for homes in this desirable area has forced the price up nearly $500k since we bought it. Just another facet to consider.