Hello my fellow Star Wars Hat enthusiasts, I did some research on where to find Star Wars Hats in the UK and this is what I found. Please email me if you have any further tips!
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HatStore.co.uk ( Free shipping over £50)
Merchoid has a small selection of Star Wars hats.
Lots of options on Ebay.
SuperheroStuff.com ships to the UK and has probably the best selection of Star Wars hats after Ebay.
Etsy has a rather large selection if you want a custom or handmade hat.