Possible Clues:

• Best fashion show on TV?
• Maximum speed of prat: ego out of control
• Jacket, etc, that motorist's in most often?
• A “monthly series for road-users” piloted on BBC Midlands in 1977, presented by Angela Rippon and Tom Coyne
• Maybe fifth bowler might be thus described?
• Finest clothes motorists get into eventually?
• Perhaps fourth best outfit?
• Principal girl’s initial attention engaged by speedy drivers?
• Best outfit? Fourth or fifth, perhaps