ECB rate is 0% at the moment so if you have a 0.95% Tracker then your mortgage interest rate is 0.95%. 4.3% sounds like a standard variable rate SVR. If you went from 4.3% to Tracker rate of 0.95%, your monthly repayments should have gone down considerably, depending on the size of your mortgage.
Will post letter wen I eventually find it among all my documents sorry for the inconvenience. I did find a letter with my balance which states tracker 0.95 with a base rate of 4.3% svr