The simple summary for PTSB fixed rate mortgages remains as per my first post
PTSB say I can pay as much as I want with no penalty/break fees. There would only be fees, if I paid it off fully before the fixed term ends.
They didn't do a breakage fee calculation specific to my mortgage, they said it's their policy.
Please, Before you do an overpayment on your fixed rate mortgages check with PTSB, in case this was somehow specific to my mortgage ( I fixed at a low rate and transferred from UB), as this is very surprising amount of flexibility.
More detailed summary:
At least four different PTSB staff say their policy is:
1. If you change your fixed interest rate during the fixed period, break fees may apply.
2. If you pay off fully during fixed period, break fees may apply
3. If you overpay and keep your payment the same, no fees apply. This is the default option if you overpay. The overpayments build up in a credit account, and reduce the interest charged. You can also use overpayments to subsequently fund a payment holiday. You can't get them refunded back to you though.
4. (
There is some doubt about this point) If you overpay and reduce payments no fees apply. In this case you no longer have credit in your account, the credit had been applied to your mortgage balance. If you want to use this option be even more careful to check with PTSB, as all ts and cs indicated that break fees could be applied in this case.
Other users online have repeatedly confirmed points 1 to 3. Including someone who worked in PTSB mortgages. Brendan found terms and conditions that confirm 1 to 3. Other terms and conditions online indicate that fees will apply.
I used option 3 and 4. But that's not proof positive that this is PTSB policy, as when I subsequently asked for redemption figures they indicated for my specific mortgage their would have been no break fees anyway.
There is one report I found online of being charged fees for overpaying but that was a commercial mortgage.