http://www.olfactik.com/ (I order on Sunday and they usually turn up by Thursday via Royal Mail. In a cardboard bocks)
and...
https://www.hermitageoils.com/ (A bit faster than Olfactik, even though they offer free postage. Royal Mail again, but they use a plastic bag)
No problems with either supplier. Hermitage have more oils, and a bigger collection of musks than Olfactik. Olfactik have a larger array of chems.
You need to order at least £20 worth of stuff from Hermitage. They'll probably mail you a discount code at some point.
-