Many thanks Przemyslaw for your prompt reply. We are very keen on it use within Moodle particularly for HW setting projects and a way to encourage more independent, personalised and responsible student learning and (the big selling point) the potential for decreased teacher workload.
The Hot Potatoes software and the work done to place it on Moodle has been a real boon to our school and teachers are now begining to think far more creatively and imaginatively about HW setting and review material.
Gideon