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Well it is an under recorded group here in Ireland no doubt but if its common in Europe it seems rather unlikely that it would go unnoticed here. Or am I wrong?

The list of Asiloidea in Ireland. Bee, stiletto and robber flies. As per http://www.dipteristsforum.org.uk/
It should be noted that Ireland generally has a low biodiversity compared to most of Europe.

Bombylius canescens
Bombylius major
Villa modesta
Phthiria pulicaria
Acrosathe annulata
Dialineura anilis
Thereva bipunctata
Thereva nobilitata
Scenopinus fenestralis
Scenopinus niger
Machimus cowini
Neoitamus cyanurus
Philonicus albiceps