Calibre Innovations is company that does all sorts of products and services for the UK shooting community and they make some fantastic moderators.
I have yet to test their centerfire line the Ducis range, but the ARMOUR range of rimfire moderators are the best I have experienced. Awesome sound suppression and a well constructed built-to-last design. These moderators are suitable for 22lr, 17 HM2, 17 HMR and 22 WMR and have even been used on centerfire calibres including 17 Hornet and 223 Remington.
Visit the website or find them on Facebook