Hello MartinBrighton,
At the risk of stating the obvious, does your fob have a good battery? However, it seems to me that the wire loop in the 'banana', linking the lock to the latch, has failed from fatigue due to over use. In that case, you won't be able to open the door manually with any key, it has to be via an effective fob.
You are not light years away from me. If you can obtain a replacement fob, which are fairly readily available on eBay, I will be happy to help you sort out your problem. PM me in the first instance.
Derek.
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