foothesnoo - apols for butting in, but I know the Bton market quite well and the house is round the corner from me .
Noddy (sorry for speaking for you!) didn't offer on either, but responded to your comment that she had bought a house in Bton recently
As Noddy says, there is one just along from the one you have linked to that is on for 310k, down from 375k, then 350K.
Both houses are terraced, and there is a big, steep slope at the back, so gardens are not huge and may be a bit overshadowed.
I personally think that they are overpriced at over 300k. They do look quite roomy, and are a bit different from the typical Bton terrace, but the area while ok, is not highly regarded, and cars do tend to race on that road (to get onto the estate further up and around the hill).
A year ago, then I would reckon that they might go for 35ok, but with houses on Ditchling Rd now on the market for around the 350k (not all, some), then no-one is going to pay over 300k to live on the 'wrong side'.
As to the OP - yep people either don't need to sell, or can't face 'losing' money by accepting a low offer. I do think a lot of sellers in Bton just don't get it yet, and asking prices aren't going down here because they think Bton is some sort of bubble. They will end up chasing the market down methinks...