Shallow IP65 Fire Rated GU10 Downlight - Round or Square

Can this be used on a concrete shed sofit area? E.g outside but under the roof in the sofit somprotect from rain
As this fixture is rated IP65 it is safe for use areas with water directed at it under pressure, so yes an ideal product for your needs.

Can the bulbs be changed from above?
While possible, the bulb is typically changed from below.

What is the depth with the bulb connected?
Just under 100mm with the lamp holder included.

Can they be fitted outdoors (i.e. under soffit boards, eaves)?
Yes they may, but if you live an area close to the coast the finish will deteriorate quickly.

Can these be wired for dusk to dawn?
Yes - you can use a separate Dusk to Dawn sensor and wire it up to the fitting.

Re the driver question, the spec says dimmable when used with a dimmable LED driver. So if used these fittings with LED GU10 bulbs and want them dimmable, would i need a driver also?
Apologies for the oversight, this fixture uses mains GU10 lamps use dimmable lamps if you wish to dim the light.

Do these require a separate LED driver?
These fixtures use a mains lamp with a GU10 base, so no driver and you can simply swap out the lamps when and if they fail.

Hi, are the white square downlights matt or gloss?
It is matt white.

If my bathroom is 2m x 2m, how many lights would you suggest I need?
For a room that size, with our pro HD lamps, we would recommend using 6 downlights.