this is one of the “standard” places in iNat that should have been adapted from GADM, i believe. looking at the GADM boundaries from https://forum.inaturalist.org/t/united-kingdom-inaturalist-world-tour/4649, it looks like what ended up in the system is a simplified version of those GADM boundaries. not sure how easy or hard it would be to change at this point. iNat staff would have to do it.
just for reference, here’s the place in iNat:
and here’s the place that surrounds it to the north:
i’m not sure of the process to change such places nowadays. you may have to flag it in the main system.