changing terms to employment contracts

[Stevanos]

Have finished probationary employment and finally got a permanent contract.

There are a couple of things I am not comfortable with...

The notice period I have to give has been changed from 30 days to 3 months!

A bonus was written in the first contract, now it says its "applicable from time to time".

These are quite big changes as far as I am concerned, any thoughts on where I stand and best way to proceed.

[Stevanos]

I'm not overly happy about having to give them 3 months notice, given there seems to be no career path despite asking!

With respects to the bonus, it was written in my job offer and my first contract, so it feels like they are changing my job.