Unfortunately it's difficult to get accurate information on interbank rates at the moment. There's a big spread between bid / offer rates, and the swap market has diverged from the rates available to banks to put money on deposit.
Hi! Do you mean that the table from "the ICE report" ( https://www.theice.com/marketdata/reports/180 ) is no longer appropriate to get a rough idea of penalty fees? I'm on a 2y fixed with KBC, hit the 10% limit but continuing to make overpayments... If there's no good proxy to get an idea of the penalties though, it sounds like it might be safer to stop until the term ends in November?