Possible Clues:

• Proper male swimmer
• Mannerly, fishy chap?
• Refined chap set up shelter
• Is it cool to leave Eton College or is that just being courteous in an exaggerated way?
• Proper posh bloke and slippery character
• Refined chap, slippery type
• Note college dismisses loco type - that might be pretentious
• Affectedly polite chap — a slippery character
• Newton, brought in to obtain fish, is polite
• Proper info the telly regularly provides