Can't see it happening. I've heard of a few here and there signing them but on the whole, I'd say most haven't and will not sign it.
Ask for the bonus to put to into the AWA, ask for the payrise (and back pay) for the wage increase that everyone should have got in Dec 2006. Ask for a 28 day notice period, the same as every other employer in the country. Funnily enough, if you are made redundant and have been in the company a while, the notice the company has to give you is 28 days.
What's good for the goose...