The post you dug up is 8 years old!
The "English" RCDs you speak of are now to an EN number now so are the same in all EN countries. For additional protection against direct contact only non-delayed models are allowed with a maximum trip current of 30mA.
I'm not sure where you get the idea of 230v being banned, it is one of the risks which needs to be assessed when specifying equipment yes but banned no.
We tend to use ceeform blue sockets in industrial environments where 230v is required.
The "English" RCDs you speak of are now to an EN number now so are the same in all EN countries. For additional protection against direct contact only non-delayed models are allowed with a maximum trip current of 30mA.
I'm not sure where you get the idea of 230v being banned, it is one of the risks which needs to be assessed when specifying equipment yes but banned no.
We tend to use ceeform blue sockets in industrial environments where 230v is required.