Thank you very much for both of your responses they were very helpful, i was most concerned about the side effects/health problems related to certain ones, but i will have to do some more research,and find out some more info hopefully.
I have been using sugar for a long time but i now want to start using artifical sweetners, but there are so many different makes available with many good/bad reviews, so can anyone suggest which would be the best one to use, ,thanks.