My warranty runs out on 5th September

1. should I pay the £400 for another years extension?
2. I want to put the car into the dealers to get its MOT early...thereby if there is anything that is required to be fixed, it hopefully can be done under warranty. However is there a list of items I should ask the dealer to check?
I have heard about issues with the Steering Racks, some people have had them replaced under warranty, where they creak under full lock.
Theres rust around the calipers, believe that there have been people successfully negotiating with dealers to get this fixed under warranty ...don't know how much chance I would have after 3 years however...probably none.

I have a couple of interior rattles, sunroof (when the blind is in the fully retracted position) and a rattle in my centre console around the arm rest...but I was told by one dealer that the warranty doesn't cover all rattles for the full period of the warranty!

Is there anything else that I need to get checked, verified as ok before the warranty runs out?
The car runs perfectly, the a/c is cold as a polar bears bum....any advice would be most welcome
