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When I tried to start it, it was like it was out of battery. Tried to jump start it, but no change. Tested the battery at just under 13v.
I have previously had problems when I go to start it i.e it doesn't turn over straight away, takes a couple of goes. Can you tell me if I need a mechanic or auto electrician?

Sounds like a job for an auto-electrician. You can search under the AA Licensed Repairers for an auto-electrician in your area.