Is it...
The guy in red and yellow hugging the captain?? (Isn't that an offence??, no, wait, it's the British Navy!
)
No tugs (Then again if the RN version of Bernard is in the torpedo room, would you want to go near it?
)
The bird poo on the bow (Seagull's can now sh!t under water at 800 feet??:hmm
