As I understand it, the "nation" referred to in "National Biodiversity Network" is the UK. In which case it doesn't, technically, include the Isle of Man or the RoI. Having said that, records from the IoM have been on the NBN for several years, and recording societies in the UK frequently go by Vice-counties (the IoM is VC71) rather than current administrative areas. Clearly this is more suitable for biological recording by geographic area as it doesn't miss out bits of the British Isles. Comparing species distributions over the south and west of the British Isles is impossible without their inclusion, so it's not as irrelevant to Gloucestershire as it first seems!
As ex-BSBI VC recorder for the Isle of Man I would hope that country names would at least be included in reports from the Atlas, and that all the British Isles would be included as the NBN has always functioned as more than just the GBIF node for the UK alone. If Ireland and the crown dependencies are to be "invisible" on the NBN then without an alternative node their presence on the global records site would disappear.
Linda