Many thanks for your quick reply, Oli. The first is preferably as there are versions of the task published which used the digit entry method - so this is preferable.
If you could be so kind as to explain how it is done, and where to insert code, that would be much appreciated. If code is changed, is this reflected in the builder; and similarly, do I still run it from the builder or do i have to run from the code window after adding this?
Many thanks indeed,