Hehe sounds a lot like Fear & Loathing in Las Vegas
- "As your attorney, I advise you to rent a fast car with no top, and you'll need some Acapulco shirts..."
Actually, you may also want to consider the good old checked golf trousers, or the glorious nylon 70's cut safari suit as more classic alternatives (See Monty Python's Meaning of Life Death scene for the checked trouser outfit).
A word to the wise on the accent front:
Dick van Dyke was not even in the same galaxy as a cockney accent in Mary Poppins. Trust me.
If you are planning on using British Rail do check with them as to what sort of leaves/weather they're expecting - this is quite important, because if they get a different sort turning up, they have to shut the whole system down - It's a tradition, or an old charter or something.
Finally if you go during the summer, water is strictly rationed throughout the SouthEast of England - It's a tradition, or an old charter or something. If you go during the winter, beware of the widespread flooding in the area.
Do pack a sense of humour... you'll be needing it.
And when you get offered London Bridge, tell them that you actually want to buy Tower Bridge, to avoid the same sort of disappointment as the last time the Brits tried the old "sell the rich tourist London Bridge instead of Tower Bridge" ploy.
Hey it's quite nice really. Trust me.