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Apologies for not getting back sooner.
Saw an excellent Spanish dentist yesterday and he 'gently' tried to pull them out again. After a few attempts he stopped and said that they were fairly well attached and that I would probably be okay until I go back to the UK tomorrow. He didn't charge me anything.
Interestingly, he said to avoid soft food like sandwich bread (which I don't eat anyway) as it forms a 'mould' round the teeth, and when you try to remove up it, you push the teeth off too. I had been eating fish and some got stuck on my teeth. I was trying to discreetly remove it with my napkin when I suddenly found my teeth in my hand. Horrible feeling.
Also, I thought that having gone through the long and painful process of getting implants, that would be me for life. Anyway.
Have been in touch with my dentist at home arranging an appointment.
Many thanks to all for your advice and sympathy.