Lending people money so they can pay what they owe you is not clever.

If the concern is the effect on UK banks of the Irish banks failing, get ready to nationalise the UK banks properly and make them act in the best interests of people in the UK not of the receipients of obscene bonusses and salaries rewarding counterproductive economic behaviour. The separation of risk and reward in banking needs fixing - but giving more money, via the Irish government, to the Irish banks is not the way to fix it.