Seems like my Laptop screen is buggered (well known technical term!).
Before I rush out and buy another one looking for confirmation if you think it is the screen or the graphics card.
I've updated drivers, updated the BIOS, opened up and checked all cable seatings, cleaned things and the motherboard etc.
I think it is the screen and really can't be arsed getting a replacement screen as the laptop is now about 3 years old and was not high end anyway.
Anyone got a laptop they no longer need? Only use it for browsing and a Roon controller.
Here is a pic of the screen.