Brass Jewellery Manufacture

Hi All,
I make some pieces occasionally for a bridalwear designer. They have always been silver but they would like some larger designs that I would say work better as costume pieces and so made in brass. This is not something I know much about as I mostly work in gold - are they any workshops in the U.K that make costume jewellery to custom design or do I only have the option to source from India or China etc? I'd love to work with a U.K based manufacturer if possible but can't find anywhere via internet searches. Thanks :)