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Strange Artefacts

Hi All,
Anyone know why I am seeing these strange artefacts in UE4? I’m very new to UE and have imported a simple scene with the default sun/sky setup. I messed around with various settings like I would do in Vray but nothing works.
HELP

Answering my own question here but it could be the fact my graphics card drivers aren’t up to date and I have raytracing switched on in UE4. I’ll sort this and see if it works