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I need a headset for my lads orange crush 2016 and I’ve no idea, do I need an internal top 1/8th and a bottom external 1/5th, I was going to buy the brand x from chain reaction as there under £20 but not sure which one
It's a right old minefield.
I found this Park Tool article very helpful when looking for a new headset for my Ariel:
https://www.parktool.com/blog/repair-help/standardized-headset-identification-system
This goes through the various options for headsets and explains the terminology used for cup sizing.
This tool is also very useful:
http://www.canecreek.com/headset-fit-finder
You can plug in the specification of your headtube and fork, and it'll tell you what cups you need.
EDIT: looks like Orange have some advice too:
https://www.orangebikes.co.uk/support/faq/headset_codes/
Thanks Tomparkin, that’s sorted it 👍