Thank you all for your advice.

I have tested the battery at full chage and it reads a steady 36 volts and 5ma.

This may seem like a silly question but when openning the trottle are the lights on the power indicator supposed to decrease to the empty position or are they supposed to remain steady? This is whats happenning on this bike and I was thinking this may help to direct me to the fault.

I am reasonably adept at mechanics and electronics so I thought I would buy this as a project to work on and if I can sort it out fine, if not, I'll probably scrap it!!