Best of luck Richard.
The only 10p Manchester that I know of belongs to Lance.
The 25p (one only I know of) and £25 Manchester (1 of only 3 I've seen) I have (as you know).
As to the Portsmouth 12 1/2p I believe Ross said he had found some but never got back to us.
Victoria Sporting Club 25p, again only seen one, is also in my possession.
I hope you manage to find some and look forward to seeing them.
Take care, have fun and enjoy the convention.