hey danstu
the skipper series helm is a great helm and providing there is no wear in the main shaft (where its leaking from) it will only require a new seal,
have you got a photo of the helm set up you can post on here?? then i can advise if its likely its worth repairing.
for example hydraulic steering helms used in center consoles where the person driving is holding himself in solely by the steering wheel normally wears out the shaft and bush's and they are not worth repairing.
regards Jim