Fees on Sterling ATM withdrawals

Does anyone know where/how to find out which ATM's do not charge a fee for making withdrawals in sterling in northern ireland, from a euro bank account?

I recently withdrew sterling, on 2 seperate occasions from the ATM at Ulster Bank in Aughnacloy, Co. Tyrone. On niether occasion was I charged a fee. In Armagh the other day, I withdrew sterling and was charged over €3 in fees. This was at a Northern Bank ATM. I am with Bank of Ireland.

Withdrew £80 from 2 separate ATMs in England and was charged €1.27 commision on each occasion. It was an ATM that said it accepted LINK (i.e on AIB cards)... Not sure whats on BOI cards (cirrus etc???)

Think comission is standard in England, but apparently not in Northern Ireland.

I use a Northern Bank ATM in NI to withdraw from my NIB current a/c.

Never pay any fee.

Probably as the two banks are part of the same group.

Ok, my next port of call is to try to find a BOI machine, to see if I'm charged there. My account is with BOI.