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Yes, spot on! There was no earth connection on either switch, even though earth wires were connected at each switch. Earth wire now installed. Thanks to all!

I'm not confident with DMM so have called in a qualified electrician who will come on wednesday. He suspects there probably is not a problem, other than the mains tester screwdriver, but I need to have peace of mind! Thanks for your suggestion

Thanks for responding. There are definitely green sleeved earth wires connected to the back of the box, but the mains tester screw driver lights up when they are touched [accepting that this is not a totally reliable test. many thanks

Thanks for that, although it seems odd that none of the other switches in the house respond in the same way to the tester screw driver. I will arrange for a check with a multimeter. Thanks again

I was about to replace the two 2-way switches that control a ceiling light when I noticed that the mounting boxes are live - as indicated by touching with an electricians screwdriver! I would be grateful for any advice about this. Many thanks