Pretentious sitcom character by chance catching cold in this country (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

C[old] in UK, all in BET (chance). The character is Hyacinth Bucket (pronounced “Bouquet”) from the sitcom Keeping Up Appearances. The Special Instructions say that “the clue for 12ac has been amended to provide the correct complement of vowels”: I didn’t see the previously incorrect version