Ran into two issues over the weekend, thought I'd share since they completely left-fielded us, might save some others some bother in future.
1) NCD expires, we didn't know this, my Mrs had 5+ years when we consolidated policies into mine, but after 2 years, they're gone. *poof*, never happened. Ouch. Back to 0 NCD for her.
2) NCD doesn't accrue against the policy holder alone, it's against policy holder's vehicle. Sounds stupid I know, what I mean is I have 10 years no claims, but I can only apply that to a SINGLE car. I can't take out two policies with the discount, I can only apply NCD to a single car. I also couldn't find a firm willing to let me split it (5 on one, 5 on another for example).
Anyway, we didn't know this and its been a bit of a pain in the arse to say the least.