Mains Fire Rated IP65 Downlight

Is the white finish matt or gloss?
Matt white - sorry for the omission.

Can this downlight be used with the dim-pull and the GU10 5.3W Osram dimmable lamp?
It can be used with any mains lamp including LEDs. Unfortunately the dimmers only work with halogen lamps and not LED.

How do you get the bracket springs to fit to the body of the light as the diagram isn``t clear and the springs don`t appear strong enough to flex the way the diagram describes.
We have added a diagram to this listing, Hopefully this makes it more clear.

Can these be used with the dimpull? Looking at using 6 lights with 35w halogen bulbs.
You can have a load of up to 250w, so your 6 x 35w = 210w will be fine.

How easy is it to change the lightbulbs, if necessary pls briefly describe the process
Do not get tools from shed/garage! Pull bezel from ceiling (the housing stays in place) remove lamp from bezel by sliding out. Slide in new lamp, push bezel back into housing. Make a cup of tea to reward yourself, dunk biscuit, enjoy.

Could you tell me the overall dimensions of this fitting please.
The diameter of this fitting is 85mm and has a depth of 5mm. I have added a spec sheet to the listing which will give more information.