Welcome Andrew!
With respect to oxygen, some folks in the UK experience problems sourcing O2 thru ya'lls NHS....however, unless there are underlying conditions that contraindicate its use, it is recognized as a viable treatment in the UK....if you have any problems of that nature, contact OUCH UK and they will provide assistance with the HOOF form.
Where are you located in the UK? I know several clusterheads in England and Scotland....a friend in Scotland hosts a couple meet n greet events every year.....nothing like meeting someone who "gets it" and understands exactly what you deal with!
Dallas Denny