Robert Thanks for taking the trouble to reply - it is much appreciated.
Unfortunately I have tried a number of times to get this work correctly on this laptop - with no success. I have a number of other Windows 8.1 laptops where it works OK - so I do believe it is a specific to this laptop. (it is a new machine I have brought for my 14 year old son).
I have tried the gesture at different speeds etc but none work on the touch screen. See also my other responses which provide more details.