mrliffey,
While the €150/month looks like a saving, beware.
If you consolidate the €20k over the remaining 23 years of your mortgage, you'll end up paying (assuming 3.25% interest rate) a total of €8,424 interest on the €20k (or real interest of €7,141, assuming 2% inflation).
But not consolidating it and paying it off over the next 5 years at a much higher rate with the current lenders of, say, 9% means you'll only pay €4,910 interest (€4,695 real interest).
So staying at the much higher rate can save you money unless you organise to keep the term short on a remortgage.