Major, major new species - the Hawk's-beard Nomad Bee

My friendly local bee expert undertook another survey here in June and was excited to find a 'rare in Wales'Cat's-ear Nomad Bee. Because of its scarcity here it was sent off to the experts at BWARS for formal confirmation. Excitingly it turned out to be the incredibly rare Hawk's-beard Nomad Bee (Nomada facilis) rather than the Cat's-ear Nomad Bee (Nomada integra). As far as I can see there have only been seven records in the UK since 1802. The first recognition that it was a UK species came in 2017 with one recorded in Lewisham. This led to a re-examination of similar bees in national collections which unearthed five more specimens, all from Southern England. Is this the UK's rarest bee?