I also pay my mortgage weekly with PTSB. and have done since the loan was drawn down. I instructed them to cancel the s/o and I manaually transfer amounts every week. As stated above, any over payments are credited to your account and this offsets interest.
There was another post here recently about weekly / fortnighly / monthly mortgage repayments. I always advise people to pay weekly if they can.
Say your mortgage is €1,000p/m... 12 monthly payments @ €1,000 = €12,000 yearly payment.
If you can afford to pay €250 every week you'll be better off in the long run.
€250 x 52 = €13,000... so you're making an extra months payment every year.
Over time, depending on the loan amount / term, the savings can be significant.
By donig the above in conjunction with small daily overpayments, (I round purchases up and transfer them against the mortgage) I will clear my mortgage this December, approx 7 years ahead of schedule.
I also had a mortgage with Bo and I also paid weekly with them,.