Trusted sources for medicinal herbs
I’d recommend Napier’s the most, their skullcap tincture is fresh and potent.
A. Vogel is a brand widely available in the U.K. who sell many fresh tinctures, bit pricey, but very good. They retail through Amazon.
Herb Pharm can be imported into the U.K. through iHerb UK, it is expensive as you have to pay for customs (add 2/3 to price), but quality is good and so is the range.