I was surprised to find these growing alongside our bins, after not seeing any mushrooms in the woods for weeks now... I thought they'd finished, but I suppose it is sheltered there, beneath the hedge.
Very, very small- I should have put a coin in to show relative sizes, but the cap of the largest is probably less than 2cm across.
Although the gills and stem are not clear, I suspect this is Mycena galericulata. You can find it all year round (the only month I've not encountered it is March). It is one of the larger Mycenas, normally the cap is 20-60mm. Many of your specimens however, have not fully expanded and final size may be affected by the cold weather; but 20mm is a fair size for an small agaric. I'd reserve "very, very small" for the common Mycena tenerrima (AKA adscendens) with a cap 2-5mm!
I have not seen any Cep this year, in fact last year only came across three. What is continuing to keep popping up next to my coal bunker is Coprinellus micaceus and I was surprised to see yesterday more wee caps appearing despite the fact that the temperatures have ranged from -6C to -11C. I only know that they are Coprinellus micaceus because you kindly ID'd them for me when they first appeared ruadh:)