I have just seen this thread for the first time and think that your original question is a fascinating one
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"Would it be fair to say that we are over spending for our type of family unit or are we doing ok in term of money management."
From what you say you have childerns allowance in addition to €600 net, which brings you closer to €700 per week.
It seems to me that this is a high level of spending for no holidays and 2 nights a month socialising. Of course I have no teenagers, are they much more expensive than babies? Do you have any other major cash drain.
We are a family of 5 and live on €90 odd a week less than this after the mortgage. I certainly think of us as being well off. The average income in Ireland for a full time employee is €28,000p.a. €538 a week gross.
Everyone has different priorities, but we manage 2 or more foreign trips on this, which we really enjoy, however I would have no interest in changing the cars (2) so often.
As to practical advice on savings you obviously have significant equity in your house. You could borrow up to 40% of the value at less than 3% pa (less after tax savings). A well designed conservative high yield equity portfolio could be expected to make a profit on this cost of capital, for example AIB shares are yielding 5% at the moment.
A pension (which you could fund in a like way) would leave no flexibility for college fees.