Trusted sources for medicinal herbs
I’d recommend Napier’s the most, their skullcap tincture is fresh and potent. Urban Fringe also sell a good skullcap tincture.
A. Vogel is a brand widely available in the U.K. who sell many fresh tinctures, bit pricey, but very good. I use them. They sell through Amazon. Note though, Amazon is good enough for some powdered herbs off certain companies, but not generally good for tinctures.
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. Generally, people in the U.S. have better options for herbs as the market is far larger.