Speak to the bank and outline the reasons why you cannot pay e.g. kids back to school etc.
Anecdotally, August and January are the two biggest months for payment breaks so the bank will expect such calls.
Try and pay interest only as opposed to taking a payment break. Payment breaks should be your last option as it capitalises interest.
Also note, that you cannot extend the term unless you have a mortgage protection policy to cover the additional years. Also, if you do extend, your monthly interest amount will not change considerably (and not at all in the first month).
So if you want to pay the least amount possible for a time, interest only is a better option than extending the term.