Hi all, I thought the cooler I just bought from eBay was made of 8mm pipe, turns out it is 10mm so these two compression fittings are no good for me! Yours for the postage cost (probably a quid or so) or come and collect, I'm in Southgate, north London.
https://www.toolstation.com/made4trade-compression-reducing-coupler/p57128
https://www.toolstation.com/made4trade-compression-reducing-coupler/p57128