Winter jacket recommendation?

For a baselayer, the Under Armour Coldgear long sleeve tops are excellent, price is usually pretty good on Amazon.

As for jackets, I have a Santini Beta Windstopper and a Gore Power Active (not exactly a race fit) for when it's raining. Both have been fine at -3°c with just the Coldgear baselayer underneath.

Shout for the Rapha Pro Team. Warm and cosy, no problems with mine three years down the line. Probably should have bought black in hindsight!

Another vote for the Stolen Goat Climb and Conquer. With a merino underlayer there are basically no temperatures you can't cycle in. It's seriously warm!

Keep an eye out for "last few" type deals if you can fit into a Castelli small (they don't seem much different to medium in my experience). I've got the Castelli Raddoppia which was £79.99 from Merlin. Includes retroflective coatings, lovely and warm (too warm for 9  degrees or so and up) and shower proof. It's replaced my Alpa so far this season. I'm beginning to think that if it's cold enough for the Alpha jacket there'll be ice so I should take the car!

Another Reccomendation for the Castelli Alpha. When living in the SE I never bothered carrying a waterproof when using it as it shrugs off most things, and have used it from between 10 C (Bit warm) to minus 5 air temp quite happily.

The best bit is the insulation is only on the bits where you need it, i.e. chest, shoulders and tops of arms, allowing heat to vent under the arms and the fin vents down the back. I also like that when climbing, you can unzip it all the way, but the sewn in inner jersey  means the icy wind doesn't then attack your chest, but allows a bit of cool air in. Down south in the cold I wore it with a normal thin merino or synthetic LS baselayer, now in Sscotland if its cold I wear it with a Castelli Flanders or Icebreaker merino baselayer. 

Gabba LS (now called perfetto), dhb long sleeve turtle neck merino base layer. Done. -9c worked fine (Scotland).

If you did want the Mavic jacket then Cycle Surgery have at least one small in their Bishops Square store.  They've bounced round in price to a stupid extent (think DFS or PlanetX.....) and I got one for the absolute bargain price of £27 but as it was too big, I returned it there:

https://www.cyclesurgery.com/p/mavic-men-s-ksyrium-elite-jacket-N1110656...

They did have some in store, marked up at £30 which is less than the above online price.  Maybe give them a call.

If not, I've got two spare unused small jackets I should clear out at different ends of the poshness spectrum if you were interested.   A lovely Sportful Bodyfit Pro Windstopper Jacket for the weekend and a much cheaper Aldi Crane winter softshell for the commute?

Etxeondo summum if you can find one.

Although I hate recommending expensive kit if something cheaper fits the bill, the best winter jacke I have used is the Castelli Alpha.  With a thin base laye I can wear it when it's as warm as ten degrees; with a better base layer it will cheerfully go down to temperatures where I stop riding due to fear of ice.  And the best part is that it never feels too cold or too warm, and never gets clammy.

For proper cold weather the Castelli Espresso jacket works for me down to freezing with only a long sleeve merino base layer.

I’m a Castelli fan - LS Gabba (now called Perfetto) and LS baa-baa base layer does me down to about 0C.  Below that the Alpha jacket with a SS baa-baa or the LS if it’s really cold.

I do tend to run hot though 

Stolen Goat Climb and Conquer.  It keeps me very warm down into the negative temperatures.

I've been riding the Sportful R + D light jacket for the last few months and I must say I've been blown away, been commuting in a tshirt and this down to around 0degrees, and so far have ridden down to -2c with just a long sleeve jersey underneath.

For really cold weather (below 5c to -5c) nothing beats the Craft Siberian jacket. For 5-10c I actually use the Endura Windchill II which I find fantastic and don't understand you don't like, especially for commuting where a race fit is not relevant unless you race to work to beat records...

I'd second the DHB Aeron softshell jacket recommendation, I've had one for a couple of years, it's the warmest thing I've got whilst still being stretchy enough to be tight fitting but comfortable, a bit breathable and a bit water resistant: http://www.wiggle.co.uk/dhb-aeron-full-protection-softshell/ . I get quite cold easily, but it happily keeps me warm down to 3 or 4 degrees with a DHB long sleeve merino top. If it's going to be cooler than that, I put a gilet over the top.

The other winter jacket I'd recommend is a la Passione winter jacket, see here: https://www.lapassione.cc/collections/man-collection/products_jackets which are very nearly as warm, not quite as stretchy, but a little more stylish.

I have a brand new with tags red Mavic Kysrium Elite in uk medium if your interested PM me

Dhb aeron pro softshell. Really nice and warm.

https://www.sportpursuit.com/clothing/jackets-tops-jerseys?upper_body_ty...

or

https://www.sportpursuit.com/clothing/jackets-tops-jerseys?upper_body_ty...

Just ordered one of the Attiq ones, on recommendation from a mate.

If you like the Galibier Colombiere, how about using that and adding several baselayers? It's harder to get the fit/waterproofing/arm length/detailing etc. right on the outermost layer than the innermost. Plus layers are more versatile...

I'm with you by the way - like my Galibier Mistral jacket