That really makes me think though: If they chucked redundancy out the window, that makes you the only person who can do a business critical task. Shouldn't that give you enormous leverage to negotiate with your employer? It often takes a lot of time and effort to get someone new up to your level. If they can't afford another couple weeks of vacation for you (in exchange for you staying on board instead of having to bring in someone completely new), then they must be doing it wrong.
What does everyone think?