Possible Clues:

• British buddy
• Friendly address is cold without its first effect on the skin
• English gent
• Brit's term of affection
• Addressee of many a Brit's "I say"
• Addressee of many a Brit's 'I say'
• Dear fellow, to a Brit
• Lord going over chapter in senior citizen's familiar address
• London gent
• Brit's address