18bikes quoted me
An alfine service is £30 plus maybe £15 postage back
, although postage maybe high as I’m in ireland.
The whole hub assembly can be removed from the shell quite easily but does require a specific tool. Then it can be re-lubricated which should stop the noise. To test whether the hub bearings need adjusting, simply rock the rim and feel for any play like you would with any cup and cone hub.
I’d happily recommend 18bikes, excellent customer service – even when they have just been broken into and half their stock nicked.