CBD is a legal cannabinoid in the UK and various forms of CBD-rich hemp extract are sold throughout the country. You should be able to locate them in your local health supplement stores or online.
While the majority of products available right now appear to be oils, you may be interested in something like this transdermal patch: https://www.hempbotanics.com/collections/transdermal-patches-suppoitories/cbd-patch
Kevin P.