I think if someone’s been living with MS for 40 years, they’ll have developed their own strategies for dealing with it by now, and it’s probably a bit late in the day to start trying to coax them into new ways of doing things. Frankly, I don’t think I’d be very interested in new regimes, if I’d managed without for four decades. Not unless they held the promise of a cure, that is - so be very wary, as there’s no such thing at the moment. Anything that claims to be able to cure MS is a scam, by definition.
Any person with MS, whatever their age, or however long they’ve had it, should be able to access the services of an MS nurse. But I realise coverage across the UK is patchy, and in some areas, the reality may fall short of the ideal. But it’s still worth asking whether the person could/should have an MS nurse.
Having said that, there is not an awful lot that can be done for progressive types of MS anyway - which, after 40 years, this person almost certainly has. Day-to-day management of symptoms (which is not the same as treatment of the underlying disease) could be undertaken by a GP. They are licenced to prescribe symptom relief, make referrals to physiotherapy, continence specialists etc, if appropriate. So if the GP’s a decent one, it could be managed locally, by them, rather than having to be bounced back to the hospital all the time.