Rear shock movement at the bottom - MOT fail

[Fazerider]

I bought Yamaha ones last time I had to replace them, though you can probably find them at a bearing factors.
It's a pain, but well worth taking the whole relay arm/dogbones off and regreasing them, especially if you ride in all weathers. I try to do it every two years, but find that's not really frequently enough for my riding habits... winter road salt gets in there too easily as they're so exposed to spray.