Could you please give a year when they left England and date for Patricia's birth.Rough guesses are good.
A search is very hard without a bit more info.
I see you also posted to Australia so you're not certain where they went.
I assume this cousin was born many years ago...otherwises with our privacy laws in Canada it's hard to find folks.
I do find people through family trees on occasion.
So,give us some dates or a rough guess and we'll see.