In reply to Phippsy: It seems that people get confused between the various schemes.
The fast track (4 months) is good for going in with little or no quals and purely working to get them; The CA scheme (15 months) is good for little/no quals and working towards them and getting some experience with groups; The instructor scheme (9 months (used to be AI)) is good for going in with MIA training or paddling equivalent and getting loads of experience and the assessment done.
These are all a bit flexible and there is an interviewing process, there's always people with different quals on each scheme.
I'm not too familiar with the NW at the lodge but I think it's like the CA but without the experience leading groups. Just phone the lodge in the evening and one of them will answer if you want to ask them about it.
Hope this helps.
Luke