Hi James

I am also in the UK (Portsmouth), 63 year old female. Most, but by no means all of the posts here are from the USA, but every one of them is worth reading. Between us all we have amassed more knowledge about this thing than any doctor.
First, it is vital that you get a proper diagnosis. There are dozens of conditions that mimic cluster headaches, and what meds works for one will not have any effect on another. For example, indomethacin (ask your doc if you can try it) will work every time if you have paroxysmal hemicrania, but won't touch cluster headaches. Gabapentin is an anti epileptic which works for trigeminal neuralgia. I took it for years before I got my diagnosis, but it was useless. I now have sumatiptan auto injections which will abort a cluster in 5-7mins. Again, ask if you can try it. Another favourite abort method is oxygen. There is a highlighted tab on the left of your screen with all the info. It MUST be used correctly for it to work, but I can imagine it would be a bit inconvenient if you are at work and your pain is constant.
If you search around these boards you will find lots of threads about vitamin D3. This regime of vitamins and minerals has had a massive impact among us, and is successful for 80% of people who try it. I've only been taking it for 2 1/2 months but already I know it is working. I have still gone into my usual cycle ( I can feel the signs) but nothing more than kip2 or 3. No matter which kind of headache you have it has a good chance of helping. Some people, chronic for 30 years or more have found TOTAL relief. Once again, it has to be used correctly, and you must get your blood tests done for your own safety, but please give it a try. You can buy everything you need over the counter, but if you shop around on the internet you will find it at 1/2 the price of the chemist shops, and you will also find the high doses you need. Even without the headaches, it's good for you, as most people in the UK are D3 deficient.
Another tip which works for many - swig down a red bull really fast when you first feel a pain coming on. It's the combination of caffeine and taurine in a sudden hit that does the trick, so any high energy drink with those ingredients will do. Doesn't work for every one but many will swear by it, so worth a try.
Also, melatonin has often been found to be excellent in stopping the night time attacks. It takes a couple of weeks to kick in so persevere.
Finally, you have come to the right place for help and understanding - something you will get little of from non sufferers. All our clusters are different, and as I said you may have some thing different, but we know your pain.
Hope some of this has been a help, but don't be afraid to come back and ask questions, or just rant if you feel the need.
Good luck with it all
Maz.