Do you have different helmets for different things, or just the one for everything?
I'm using a bell stoker (no Stuart not a bell stroker) for everything atm and its impressing me a lot

Just one for riding, an old Met something-or-other. I have enough other helmets for other stuff, 3 kayaking helmets (river paddling, squirt boating and canoe polo), a climbing helmet, a multisport lid...

A skanky specialized one for commuting and a good specialized one for everything else. Could do with a new commuting hat though as the skanky one is past it's best....

Kask K50 for all bikey needs.

Its not very good with oakly type straight armed specs, or with use helmet bracket (though its not hard to find a large dia plastic washer to solve) but its supremely comfy

I've got two Giro helmets, a Hex and a Xen. One has a light permanently attached for the weekly night ride. They both get used for a bit of everything. I also have a full face for uplifts and Alps DH but that's not seen much action recently.

Giro Xen; one for everything. Should probably think about replacing it soon, though,

Giro xen on the mountain bike and a laser for the road bike. The laser is vaguely exciting as it has an aero cover that keeps out rain and hail stones

I only have a cheapy Raleigh helmet.
It says it upto the UK standard but im not sure exactly how good the standard is or what it means.

But it does have a little red led on the back of it that flashes. lol

MTB I have a xen.

Road I was using a Giro Monza but that has just been given a winter duties role as I picked up a Kask mojito.

I've got a Giro hex for MTB evening and weekend rides, and a Giro Indicator for the off-road commute to work. I basically liked the look of the hex so conjured up a two helmet solution in my head to justify the purchase to myself.

If Giro did the phase in a green (along the lines of the blue they do) then I'd be fighting the urge to purchase one to match the bike!

Still using a Giro Pneumo that's some 10-11 years old for everything cycling.
Reckon I ought to replace it, seems solid still though.

Spesh Tactic for off road & commuting (matt black but with black reflective tape) and a Kask Mojito for road rides.