Whizz wheel option
Thanks to all for the illuminating replies.
For clarification, i will not use any form of calculator in the exam that is not expressly permitted by the regulations, "sympathietic" examiner or not.
I think i will try to master this device and if successful continue to use when (if ever) qualified. If I end up having diffs with it i will go "electronic when qualified.
Thanks again to all for a truly interesting and educational debate!
Biffo