In reply to everyone:
Cheers for the responses guys, I shall check out what Decathalon have on offer; I hadn't thought to look at what they offer as the nearest shop's in Southampton, so not close, but the web's a wonderful thing.
Was diagnosed with MS back in 1992 Jon so it isn't a new thing, it's just moved from relapse/remit to secondary progressive over the last few years. Which isn't a cheery thing but I have to agree about the positive attitude; on the one hand, MS-related issues meant that I was forced to retire two years ago. One the other, I don't have to go to work any more. Back on that first hand, I can no longer do things which I have enjoyed for many years such as climbing and hillwalking. On the other, I can (and do) do what I can whenever I can. And every day when my wife gets up and goes to work leaving me in bed, she hates me a little bit more; which we're both cool with, it's just that one of us is driving to Bristol while the other can go back to sleep.
Life's path can contain twists and turns...
But thanks everyone for the advice, I shall follow it up. Cheers!
T.