Old coin exchanges ???

Hi there, I'm a Japanese motor trader visiting the UK next month. I'll be landing at Manchester Airport early in the morning on September 9th.

Thing is, I have collecting some of the UK currency (and few Scottish banknotes) like these from my friends, but most of them are quite old. I know I can exchange them at a post office or simply use them at shops there, but if I could exchange them with somebody here for any bit of profit, I’d be delighted.

I also have ancient Japanese coins and notes I collected a decade ago. Please let me know if you guys are interested in them as well.