What is this please :)

[SaladSauce]

It smells like a herb .... almost minty but not.

Sage?

Oo might be. It just popped up on our lawn, I quite like it

It's quite a thick spongy leaf

I don’t think that’s sage.
I have a big common sage and the leaves are fuzzy.
Those leaves don’t look like they feel fuzzy at all.
I think that’s a weed of some sort

Not a weed. Let it flower and see :)

It looks like sage.