The familysearch link in my last post is to a Brazil immigration record from 1963 - if you click through you can see the original. It's something like a landing card - it has a photo of him, details of his passport, etc.
On it, his parents are listed as "William & Margaret Frost" and his birth as 4.4.1905 in Withington. Since the birth date would have come from his passport it should be right - the parents' names I presume he supplied to immigration so would be correct as far as Alan himself was aware.
It appears to be a temporary visit, possibly a business trip.