I actually have that calculator coded from a while ago… 
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That’s awesome! Never thought of it like that. Helps with staying off the sweets and the smokes👍
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Im quite lucky, I found a bloke on Facebook who makes his own juice and sells it, he lives 2 minutes away from my workplace and only charges £8 per 100ml if I order 500ml he has about 30 flavours and I like his stuff and he will do whatever strength I want but I keep thinking I should get Into DIY and do it myself but at the price I’m paying there isn’t really any Incentive for me to Learn… Yet… 
If anyone wants his details let me know as I think he does free UK postage
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What’s even luckier is if you decide to make your own you are in the best place to learn 
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