Hi Iain,
Agree with Wee Piglet, give the Glucosamine a go, if the toe continues to deteriorate after say six months of that there is a new concoction available from the States that is based on some sort of cattle extract (stop me if you're a veggie of any sort) that a client of mine has been taking that, at the monment has avoided him needing a hip replacement. It's not cheap though, comes in at about £170 for the course (a month) but if you go through with the course, and the strict diet that comes with it, it appears to counteract the arthritis.