TAW gurgled happily, sounding much like they were
saying:

http://www.chavplate.org.uk/

Theres one on there where an Irish plate has been amended

Just one?

- would you break English law having poor character/space definition on
a foreign plate - or is Irish/English interchangeable?

It's a "British plate". Northern Ireland has a separate registration
authority, but their plates can be transferred to Swansea. The same rules
apply...