Robinsons do a nice leather one, and Countrywide Farmers do leather headcollars with goldy/brass type of fittings at approx £19.99 with throat clip and go up to a very big size for WB's, that fit lovely over a bridle when tied up to a trailer at a show for instance.
agree about the leather ones from Countrywide, I have two for my boys and they look really smart - both have quite pretty heads, and these headcollars aren't as chunky as some, so they suit them well. I have no idea how to add a photo but PM me your email address if you want to see a picture of one on a grey horse...
I brought my grey a lovely Navy one from Dever. It matches the rest of his Navy travel stuff and they do other colours, bit different from the usual black or brown.