If you didn't know, the use of capital letters in posts is seen as "shouting..."
As for the cap, you could ask your AIs if they have any contacts with the Regiment, or you could try one of the surplus/militaria collectors websites, such as Silvermans. You could also try eBay, as all sorts of stuff turns up there.
Try these guys and ask them if they have the pattern you're after...
if you look up Johnsons in Leeds on the internet and give them a call they usually have all manner of peak caps and other bits of kit quite cheap. Not sure if they've got a website so try yell or something similar.