Forge may well be made in China, I don't actually know, but a lot of UK products are made in China, with the right factory, their technological advancements over UK industry are advantageous, and coupled with low labour rates, it produces a superior product for the UK market.
A cheap chinese factory is the same as a cheap UK factory - rubbish. However a good chinese factory is almost always better than a good UK one.
China are the world leaders in manufacture.
That said, if Forge are using UK processes, then maybe they SHOULD investigate the Asian factories.
Regardless, I've NEVER heard aything bad about Forge, and I speak to a lot of people and am on a lot of websites.
Forge products are A1, in fact I spent another £40 with Forge on assorted silicone bits yesterday and they will continue to have my business.
I would have no issue buying their Diverter Valves.
(Although they still havent answered about why they use OE heat piping on their FMIC's)