Possible Clues:

• Crew said it's likely to be passed at Chiswick
• Crew said something at Chiswick in Boat Race
• Going in westerly direction towards the ancient isle
• Going north, to the old island
• Fawlty Towers waiter
• There's one at Chiswick, crew said
• Flirted endlessly going over island
• Sounds as if I'll be just a little in the river
• Model aeroplane's last to turn and land in the river
• It's back to you I'll sound in the river