I would buy a huge takeaway (your choice), take a tube to Tower Bridge, go over the bridge, turn right and find David Blaine in a box hanging from a crane. Tell the minders that you are a family member with some really important news, get in the box and say, David, it's like this, you are a magic bloke, if you turn my �100 into �1000, I'll give you this lovely hot meal - for free..........