Excellent stuff, mate.
A small logistical hurdle, but one there must be a way around - i’ve found it really bloody hard to transport liquids. I sourced something a while back to resell online. Initially had no issue sneaking them through via Royal Mail, but some stopped turning up, and i started getting letters about sending prohibited goods. Then the same happened with Hermes, and couriers with liquids services were expensive. It’s easy for a residential customer to post the odd tub of something, but they’re a bit keen when it comes to businesses doing it.
You can probably wing it with mainland addresses, but they do spot checks on anything that travels by sea or air - Ireland, some Highlands, Guernsey, Isles, etc. Might be something to bear in mind before you source your bottles, as you might be able to work around them. Royal Mail allow up to four 150ml bottles, as an example, so you could maybe source containers that size and do single bottles and kits of all flavours, idk.