Just exchange them for what you like. They are not in particularly great condition nor serial numbers are fancy. Not to say Elizabeth II is jumping out out of every pocket in terms of banknotes. So many banknotes with her face all over the world.
If you would have for example birth date of Churchill or Elizabeth II as a part of serial number i would shell immediately around 50 pounds in this condition. In UNC, times 10 of 50. But that is me, some other collectors like other things