Check back later im sure some one will have upto date advice.
The bank your planing on using is it near the missus, might be worth her asking inside. if its a small branch they might get a little shaky if a brit walks in with 500 quid in british money (how they tell if fake etc)
Most likely best to gt your missus a gfmc card or even yourself so you can draw the money as pesos
Then not have to worry about the days exchange rate or if the bank will accept you just know in a phill bank it will take hours for the cashier to speak to her supervisor her to her manager the manager to their area manager etc etc. Even if others tell you and the Mahal checks out for you in advance.