Ah! so that's where the 8818 comes from, it's actually €10k .
Nevertheless, these new rules are already in effect as i have been notified as such directly from HMRC (see quote above).
I plan to de-register from MOSS this quarter and calculate all my VAT in terms of UK vat as indicated.
This is not a "going to be" it's already here. If brexit happens, then there might be a subsequent change. There's a link above that addresses that case.
It is possible that the ITCH gst/vat calculalation can be made manual and not automatic per EU state. We could just type in the relevant numbers then. For example i could just type in 20% for every EU state to override the default.