Right first and foremost, thanks for all the replies chaps
Its the threaded section of the though ball joint thats failed, I think its been done up too tight with a windy gun, so Im obviously suspect about the other side now, really didn't expect to be swapping suspension components on a 4 month old car
I'll have a word with my freindly parts guy and ask him to have a word with the service manager, if they dont want to do the one side under warranty, ill just order a pair and get the guy who windygunned them on to get his torque wrench out . If they do do that side I might get the other side done anyway for peace of mind.
Cheers Chaps