Hi Django,
I am not from the UK, but i got my plastic parts from
3distributed on ebay. He is from the UK. I was very pleased with the parts he made for me.
Reliable sources for other components in the UK i do not know. I have a webshop in filament (based in the Netherlands), you can always check the shipping rates and see if that is acceptable.
Good luck with your build!
Jonnie
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[
www.filamentenmeer.nl]
PLA in 15 different colors
ABS in 17 different colors