Transfer your CC balance to a CC with a zero % rate for new balance transfers.
Then pay as much as you can possibly afford into your SSIA, with anything left over going off the CC.
When the zero % CC offer runs out (see the best buys list on this site for zero % offers, and how long each one lasts) change to another zero % CC provider until your SSIA matures, then use some of the proceeds to pay off your CC balance.
If you contribute an extra €200 p/m to your SSIA till May 2007 the government will give you - for free an extra €750!!