Chosen Solution

Laptop is only a few months old (bought may 2018) and has never been dropped etc. When laptop is turned on the screen produces this..

. Which then progressed to

and then

. What may be the issue?

Sorry guy your display is gone. Apple is had issues with the ribbon cables between the LCD panel and the T-CON board which is within the main case. Here’s a good breakdown of the connections:

You’ll need to visit an Apple Store to see if you can get it repaired under extended warranty (warranty exception). If you’re lucky you live in a country which has a two year warranty requirement or you have Apple+ service contract thats still valid. Otherwise you’ll need to fork-over $700 USD to get the display assembly replaced.