Update...
We found a few alternatives (no cellars but good potential listening rooms).
We put our house on the market and accepted an offer £10k above asking price.
We could start our search in earnest except for the fact that all of our short list had gone.
We spent last weekend scrolling through Rightmove looking at nearly every house in Dorset within our price range, some extremely attractive cottages but none that would give us what we wanted.
We extended the search to Devon and Somerset without success.
We were feeling disappointed but at least we were now in a position to make an offer should anything come up.
Then we had a phone call from an estate agent. The house with the cellar was back on the market, he asked if we were still interested. We said yes and quickly negotiated a price (matching the previously accepted offer) which was accepted by the vendors. This was well below the original asking price, so another result!
The original buyer dropped out due to the local crime figures. No one we spoke to could quite believe that, it's hardly a hotbed of crime down there.
Anyway, the survey is now booked, finance is set up (we will finally be mortgage free) and we've started filing in the various documents. Mrs seagull has overcome her reservations as we will have some extra cash to spend on the garden, which isn't inspiring but has potential.
Looking forward to a new chapter in our lives.