hi if you look on the rear of your licence that will tell you what you can drive i think your ok with 3 wheelers but not four unless you get one of those city type cars noel edmonds sells i think they have handle bars and not a steering wheel but check first
Don't know the specifics....it's all to do with vehicle weight....DVLA should provide you with answers. Just as an example, my 6ft 5inch brother-in-law has been driving a Microcar since upgrading from a Reliant Robin. Click on http://www.micro-car.co.uk/index.html for details. He's a good driver but just refuses to put in for a full car licence.