could be bluebells/last years hyacinths.

do they have an oniony smell to them? if yes then allium [though rather early]

My initial thought was bluebells but it's a bit early. Even down in the mild south, mine aren't showing yet

Could they be the leaves from autumn crocus emerging ?

that seems too early , well it is in my garden, but they do look a bit like them don't they Badfish.

I would say Hyacinth and they do emerge early if it is mild enough.

My bluebell/hyacinths are coming through, so are my tulips which worries me a bit. I think they might be ok as don't they have their own form of anti-freeze?

My bluebells are showing now, but only just.

I'd go for hyacinths. The leaves look rather too broad for bluebells and a little too bright green for tulips? Its wait and see time!

They look like dwarf tulips or could be the foliage for snowbells. My snowbells have been visible since last October just like the grape hyacinths. Hope you post more information when they flower.