Your Personal Statement goes to all 5 UK unis you apply to. It should be about how well suited you are to study Classics, from your previous work and any extra reading or research you have done. Your application is evaluated by the people who will be teaching you, not an admissions officer. There is a ton of advice about writing a good PS out there - plus the UK version of this site The Student Room.
Your Letter of Rec needs to be from a teacher who can say how great you are at Classics - or something related like Latin, or History, or at least what a great researcher and writer you are.