First off, Crabtree, MK and other accessory manufactures don't only supply the UK market, we have used these face plates in the middle east that tend to use a variety of different outlets for different voltages bands, including the Yank and UK standard accessories...
Why someone would want to install American standard accessories in the UK is beyond me, but i've found over the years they tend to always bring or try to bring America with them wherever they go!!. ...lol!!
As others have stated these outlets can't be safely used on 230V systems least of all ring circuits. They have a 230V outlet that are similar to the 115V design but with a different pin configuration. None of them fused!!! Can't see how any Yank outlet style plates will conform to BS7671!! Apart from anything else they, and the plug tops are crap, thinnest 16A flat pins of any plug top i know of...
If your registered with one of these scam providers, seek there legal advise before doing anything along these lines!!