Well, I checked the rear bearings on my Dave Yates, and yep, they are knackered. Must be my hamfisted fitting method. Hey ho. New ones on the way, which I'll fit in time for the Easter Arrow (for some reason, I only have one spare set of bearings IYSWIM, instead of the pair which I expected).
I also serviced the hubs which came with my Orange Oakley Clockwork - mucking about with cup n cone bearings is such a satisfying job, and I was so taken with the sealings on the hubs that I think I'll keep the wheels.