I am perfectly happy with your comprehension test pinto , as long as I get to set the questions and mark it. Oops, there could be a problem there? Well , to be fair , I suppose we would need to elect a body to administer the system . Why do I feel I am going around in circles ? Perhaps we just keep it simple , 18 , or 16 at a pinch , with no upper limit. Not perfect , but not that bad. cheers