Winter and Cyclocross tyres / tires

Wondering what the consensus is on studded tyres for winter commuting in London? One on front or both? Or not worth it at all?
We have a pair of 26” schwalbe snow stud in the house we got years ago for cheap and liz has 2 commuters(one 26” and one 700c). Both have guards so fine on wet days. As the 26” doesn’t see much use I figured I’d set one up ready to to go for proper frozen mornings.
The snow studs are only studded on the shoulders so shouldn’t be too skiddy/noisy on tarmac. Basically just wondering if anyone has much experience commuting on them and if they’re considerably better/worse than the big apples on there at the mo.

not worth it in london, except for maybe one day if we get a snowpocalypse

Yeah, as I suspected.
I used a front one a couple of winters ago for commuting at 5am along canal paths and industrial estates. The Rice Krispie popping noise as you ride along is a joy though.

I’ll throw the snow studs on her troll instead if we get a proper snow day to go out and play in the woods.

Wondering what the consensus is on studded tyres for winter commuting in London? One on front or both? Or not worth it at all?

Disc brake? if worse come to worse, just put zip tie on the wheels and ride with caution.

Rim brake on the commuter. Tbf if it was dangerously icy she’d prob just take the bus.
The bike needs a service anyway so might chuck one on the front for the ‘gram. That bike is mostly used for guests anyway so no harm in it as there’s every chance she’d ride her other bike all winter anyway.

Edit - I put one on the front. Took it for a spin and it’s not as slow as I remembered.
It may or may not get used but it looks and sounds ace which is good enough!

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First properly cold morning here in southern Sweden yesterday, saw lots of bike commuters slip and fall. I almost stacked it twice, apparently summer cornering habits die hard... Dug out the studded tyres (30mm schwalbe marathon winter) last night and today's commute felt much better. Having a few butt-clenching front wheel slips in fresh memory makes the terrible drag and noise they make much more bearable.

It's been over 20 years since I last rode on MTB tyres and I currently find myself doing so on the road (long story). I have no idea what to expect in terms of 'puncturability' in comparison to road tyres - where I always carry a tube/pump but thankfully almost never need them. Am I asking for trouble by not carrying spares?*

*and yeah, I know, tubeless.. blah blah blah..

Am I asking for trouble by not carrying spares?*

Errm I'd always carry a pump, leavers and some patches / glue.

I'm taking my croix de fer to the GF's parents with me over crimbo. There's some nice woodland tracks about and the GF's dad does a bit of mountain biking. Instead of going off road riding by myself, it makes sense to go out with him but I'm gonna need some 700c tyres with nobbles. Would these Conti Cyclocross Race be enough or do I need something more substantial? I have no idea about tyres with nobbles or riding on roads without tarmac...

35mm tires feel woefully outgunned when confronted with wet roots.

Hmmmm. Thanks man. I reckon I could just about get up to 40mm - surprisingly roomy are cdf’s these days. Will get my bargain hunt on...

Let me know if you find any knobbly tyres at that size which will fit a CdF - most CX tyres seem to be 35mm & then there's MTB tyres which are generally too large. I'm looking for something similar for my CdF, but 38/40mm knobbly tyres feel hard to come by!

What’s the go to winter commuting size for optimum comfort/speed

Sub zero or above will radically affect recommendations.