This pattern has been repeated in a number of European countries that had relatively few infections in the first wave (Czech Rep/Poland etc). However, they didn't have to deal with the new variant.
In Ireland the combination of a lack of immunity, seasonality and the new variant has led to astonishingly high R. It will lead to serious problems for Irish health services.
Back in March Patrick Vallance said that if you suppress the first wave too much then you get a massive second wave (this is basic epidemiology). Suppression was always a gamble, because if it doesn't work (for example because of a mutation), then you end up with a tragically high 2nd wave that overwhelms health services.
Vaccination has probably come too late for many places in Europe.