Hang on - we're getting further and further away from Chapel-en-le-Frith.
I suggest we wait for Rudolf to get back with more info on what he knows already - things like:
what's on the birth certificate
Ronald's entry in the 1939 Register (if any)
Ronald's marriage and death details
Finding a baptism in 1920 in just the Chapel-en-le-Frith district may be tricky, because few records are online, but I don't think there's any need at present to be looking in other parts of the country.