So when you're out in nature and ran out/ forgotten your tea bags what do you pick to make a brew with?
I'm not an expert on british biotopes, but when you mention pine, as a Swede, I'm thinking maybe there are blueberries? The leaves are good for tea.
EDIT: Sorry, I meant Bilberries. (Just looked it up)
Well, then, just pull off the fresh leaves. A handful in the bottom of your cup, and pour boiling water over it. Steep for as long as suits your taste.