What banknote has the Queens face on it?

Answer 1

Queen Elizabeth II became the first ruling monarch to feature on Bank of England banknotes when the 'C Series' notes were issued in 1960.

Queen Elizabeth II is on the obverse (front) of all Bank of England banknotes since then.

Answer 2

You do not provide any details of the note.

Any banknote with a "genuine" printing flaw would have some value, above the usual, as a collectible banknote.

Genuinely flawed banknotes are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the printing process, and have escaped detection during quality control at the printers therefore, a valuation cannot be anticipated.

A reputable coin dealer should be able to identify and confirm the note as genuine and make a valuation.