Social welfare credits

Thanks for your help Black Sheep and Welfarite, I am eligible to pay voluntary contriubutions it seems. Out of interest, how would I work out what the approximate value of these contributions would be in the future? I would have to pay %6.6 of my previous salary as a VC, what sort of shortfall could I expect to have in my pension if I don't make VCs for a couple of years?
 
Your pension will be calculated on the total number of PRSI payments and credits made during your working life divided by total number of years since first entering employment, to give a yearly average.

A yearly average of 48 is required to give a full pension at age 65
" " " " 24 will bring a 98% pension.

Changes in that situation are expected in the future