So the 1939 Register went online this morning on FMP. This is a UK/Wales census substitute, so limited value for Irish ancestors.
Disappointingly, it's not included in existing subscriber packages (I have the most expensive one too). They've been pimping it heavily for the last month but I never saw any advance warning of it costing extra. Their twitter is inundated with negative comments too. From there, I've gleaned that there is a 25% discount for existing users but you have to email customer service for a code, or something.