How to open Baxi Fire front?

Hi peeps!

I'm redecorating my livingroom, but now I wanted to open the firefront to be able to plaster around it properly (have taken ugly tiles off the mantle piece, so it's left gaps in the wall...), but I don't know how!
I know it opens like a door (hinged on the left), as I've seen it done before, but I need to know HOW? Is there a catch or something to unlock it?

It's a C5 Baxi old-stylee

C5, you pull off the brown access panel at the bottom, there will be a screw in each corner holding the firefront to the fire, remove these and pull the fire control knob off from the top.
The firefront should then lift off, but beware if you have any little un's running around, that area will get very hot if the boiler / fire is in use.
Also be careful not to obstuct the air vents at the side of the firefront with anything. Chris