There are a number of online resources and local clinics that you can refer yourself to without seeing the Dr.
Not sure if you need to loose weight then try out this weight calculating tool.
Manage Your Weight
For a range of advice and services to help you loose weight see the Better Health website
Manage Your WeightThere are also private services (that you would need to pay for) such as Weight Watchers and Slimming World who both provide popular classes locally.