An update for you all. After 5 weeks being repaired, (waiting for bits) the laptop is back. It had to have a new main board and a 'dc power' board. So there you are. Running properly now. They wouldn't say what caused it, whether it was manufacturing or a problem that developed while I had it. Just so you know though Tech Guys who fixed it (PC World) stuck a big sticker on the lid which didn't peel off easy so the lid looks a mess at least it'll be easy to identify and so less likely to be nicked. They also delivered it back to the store with the packaging and not in the package. Pretty pointless having the instructions to make sure it is securely packaged in transit when they can't do it themselves.
Back to normal now though (whatever that is)