There's a bit of play and some creaking, so I assume the bearings have gone. How do I replace them?

ANyone?
Cheers.

The bearings are just a press fit on the axle, but they can get stuck in the cups. Use a bearing puller to make life easy for you. If the bearings end up in the cups, then drive them out with a drift, being careful to swop from one side to another so you don't damage the cup.

Phone Royce if you have any problems/doubts as Cliff(?) is the most helpful chap.

It's a fairly easy job. Like TrevorB says, a bit of carefully thought out hammering normally does the trick 😀