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Here are my top 10 Chronic Pain Supplements for the United Kingdom:

1. Sam-e (S-adenosylmethionine) Anti-inflammatory and analgesic properties, helps cartilage and neurotransmitters
2. Bromelain (Pineapple enzyme) – Anti-inflammatory and analgesic properties and has positive implications in cancer and other diseases and syndromes.
3. Artic Cod Liver Oil (With NO added Vitamin D, note the product will show a small amount of naturally occurring D.) Omega-3s block inflammatory cytokines and prostaglandins, and are converted by the body into powerful anti-inflammatory chemicals called resolvins. Contains DHA and EPA, which have positive implications in dozens of diseases and syndromes.
4. Turmeric – The curcumin (active ingredient) blocks inflammatory cytokines and enzymes.
5. Boswelia (Indian Frankincense) – Anti-inflammatory and analgesic properties, may help cartilage
6. White Willow Bark – Acts like Aspirin, a Non-Steroidal Anti-Inflammatory or NSAID
7. Capsaicin – Reduces pain tramsmitters (Capsicum frutescens)
8. Ginger (Zingiber officinale) – Has anti-inflammatory properties similar to NSAIDS and Cox-2 Inhibitors.
9. Glucosamine/Condroitin – Good for Cartilage
10. Boron – Helps rebuild bone, relieves osteoarthitis, see my blog: Boron-A Mineral that can do so much for chronic illness

Sources: http://www.arthritis.org/living-with-arthritis/treatments/natural/supplements-herbs/9-supplements-arthritis-8.php
http://www.webmd.com/a-to-z-guides/prevention-15/vitamins/chronic-pain-relief
https://draxe.com/6-unbelievable-health-benefits-bromelain/