I got same email earlier and also asked them to explain why, despite them saying my account has been automatically upgraded, I can't access today any more than I could yesterday
Pro is now showing as £159.99 per annum, about 60% more than I paid on my last sub renewal for Britain 12 month sub. Since I so rarely need anything outside Britain, not worth paying the extra for. I don't think I'll bother to renew when it comes due in September, if Pro is the only alternative.
Probably a way to rake in more money ahead of 1921 census being available