Dear Original Poster,
I am currently aware of two schools saying they're approved: Rate One Aviation operating out of Gloucestershire and Booker Aviation operating out of Booker. I spoke to the latter over the phone and they confirmed having the ATO approval but at the same time reported substantial problems with getting their candidates put forward for an EIR test due to it all being up in the air in the CAA (examiners not ready or something like that). So I guess it's still a waiting game for now.
Regards,
/h88