I would surmise that prior to the UK exit from EASA the vast majority of folks from Eire did their seminars in the UK. Short term this looks like a problem for those who now need a seminar.
I assume the various UK providers would quite like to gain EASA approval for their seminars (after all the seminars were EASA compliant last year) and the fact that they have not yet done so is presumably down to difficulties obtaining that approval.