The Guideline warrenty seems to be delt via an office in Sweden.
The cost of replacement parts is £39 for single handed, £49 for double plus shipping from Sweden, so add at least a tenner I would think.
Not sure how long the warrenty is as it does not say.
They do seem to replace parts quickly according to some of the forums, but also some folk have said older rods do not have spares and therefore cannot be repaired. I believe Orvis will replace an older rod with a modern equivalent (think there may be a small charge for that)