Stephen & Rob, it's working again! First I directed a jet of compressed air into the orifices, from a safe distance to avoid too much force and condensation. Then I placed it in the airing cupboard for about 60 minutes. After all this it worked. Not a very scientific approach because I don't know whether it was the compressed air dislodging dust or the airing cupboard evaporating moisture that did the trick. Thank you both for your replies.
John
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