My UK son, currently living in HK and with UK passport, wants to marry his HK fiancee over here in UK. The UKBA, which we have studied in great depth, seems to suggest that his fiancee needs a visa to register the intent to marry in the UK, followed by another one to actually marry when they intend to the following year. Within the same set of guidelines the UKBA seems to state that she does not need a visa. All other requisites for getting married are understood and correct, and they want to return to HK after the wedding.
Does she need a visa at all, given that she wouldn't normally require one at all to visit UK?