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Thank you Tony.
Now that I re-read your post #1, the reference to BTN along with LED1 now makes all the sense in the world! (wondered what code snippet was being used)
Have been so immersed in the website tutorials, totally zoned (two years since I touched it) on the fact there remains the tutorial there.
Robin
Please see in the attached screenshot, towards the top-right. Cheers, Tony.