Hi'welsh apples, lemon bottle brush and crimson bottle brush, family ,myrtaceae,species,citrinus,genus callistemon, height 8 to 10 feet, hope this helps.

If it is in Sherwood Forest it is a garden escape. Watch out or Robin will have it, or maybe the Sherriff.

I suspect this is a joke, isn't there a variety called Little John?

Checked it out, yes, Callistemon viminalis 'Little John'. Very funny Welshapples :-)