The problem started with the screen not responding to touch, irrespective of the sensitivity setting, which, as you can well appreciate, was quite inconvenient.
The next development was a random selection of menus, totally unrelated to what I was doing eg. the timer menu would open or the model selection menu, all un-commanded.
The final straw was actual 'cracks' appearing 'in' the screen, apparently on the underside, because the screen is smooth to the touch.
I will take a photo and include it in the next post
Thanks for the feed back and I'll contact SMC - I haven't tried Germany yet but that will be an option if help in the UK is unavailable