Many times Pete. Love them. Use them to wind down at night.
PS. Nothing wrong with my maths knowledge btw. When I was at school, Maths, English & Technical Drawing were my best subjects (Top of the class every single term).
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Having seen all the rules/guidelines for setting/solving cryptic clues I know that, had I shown an interest in these earlier, I would stand a better chance but would still be very restricted by my poor general knowledge; hence not much incentive to spend much time on it at my stage in life.