Last June I spent 6 hours in london. It cost me $500 dollars, just for a lunch meeting, transportation to and from airports, and a place to keep my bags during the meeting.
If you are going to spend the 9 hours, then when you land, change at least $500+ into Pounds Stirling. You might feel that this is silly, and you won't need it, but TRUST ME, you will!!
Mark my words Lloyd!!! London is one of the most insanely expensive places around.
.Have fun!
