Al wrote:
Doubt it. Far too early for those, and they are rare.

You're right. Now it's fully grown it's clearly something different

Like I said, I'm rubbish at identifying mushrooms

Waves to Urglers...

Mushrooms and Other Fungi of Great Britain and Europe by Roger Phillips
is usually recommended - over 1,000 colour pics.

A. virosa is generally nicely-proportioned and deathly white all over.

--
Rusty