After reading this, i took my front wheel bearings apart even though they were running smoothly.
The bearings seemed OK, but I found that who ever assembled them for Caterham had trapped the seal on the inner bearing in exactly the same way on both sides.
Consequently, there were pieces of rubber seal torn away and the seal which is an L shape was missing a small piece for about 40% of the diameter.
Initially I was going to replace the bearings. However, the rubber seals still completely fill the hole in the outer race, and I suspect the seal as it is now is no worse than the felt washer used on previous designs.
Also, there was no noticeable play in the bearings and they didn't require any adjustment, so wear must be minimal.
I have greased them and reassembled them and plan to take them apart every year to check/maintain them.
It is surprisingly straight forward to do