Cedric said:3. Cycling at a low cadence/ in too high a gear. Again I think that this is a security thing. In a high gear you get a lot of feedback to your leg muscles. This makes you feel like you are in control of the pace and movements of your bike. It took me a long time to learn to cycle in easier gears and in a higher cadence. I think this is called spinning?
Perfect! I was doing this. I've now switched to cycling in an easier gear and suprisingly it's easier to keep up a decent enough speed where as before I was just ever so slightly faster but completely knackered after a short ride now I can seem to go on for a fair bit longer.
Great help from everyone, much welcome change to most forums where you get shot at for asking questions!