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Chefsflavours is the place to go. Free shipping if you spend over £30 (which is easy to do) and their customer service and delivery speed is on point
For DIY concentrates, chefs flavours all the way. They carry damn near everything and they rarely make mistakes. Quick shipping as well. Website is a bit slow though.
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For PG/VG I still use darkstar. Honestly this is because they used to be the go to for Nic back when it was still available in bulk for vaping (I bought so much 2 years ago I still have a liter to get thru before I have to figure out where everyone buys it now). But they use nice bottle and they are dirt cheap. I also buy some one shots form them when I re-up PG and VG. All have been good.
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I also have used Vapour depot for concentrate on the rare occasion that chefs is out of something, and they do an in house cookie flavour I have been addicted to for over a year (Its damned expensive though, which I could find a clone for it.....) But they are good guys, active here on the sub, and very helpful for new users. so they get a heartfelt recommendation as well.