Where in UK or us can one get a trilby hat identical to Foyle's in tv show Foyle's War?

Great question. I believe Michael Kitchen wore two different hats as he played the role of Christopher Foyle. In the earlier episodes, he wore a flat-topped "pork pie" felt hat with a "stingy" [narrow] brim; that hat was unusual in that it didn't have the usual pork-pie hat circular ridge on the crown. I've spent too much time searching for a hat like this. Pork pie hats are available in felt but have, well, pizazz that the Foyle hat avoids. "Bucket" hats have a similar outline but are made only in canvas and other casual materials. In later episodes, Foyle wore a traditional felt fedora.