benoitdd
HS2 31 is located in Sulaisiadar (at least was there 9 years ago) (https://www.geograph.org.uk/photo/3121402); so we can maybe already remove the wrong value.

From a list released by the Royal Mail (https://www.whatdotheyknow.com/request/location_of_every_post_box_that), we know that HS2 61 corresponds to "BreascleteSchool" and is indeed the right value, but this information can not be used because the license does not allow it :( unless some opendata has been published more recently by Royal Mail?

