You need to prove provenance of the money you use to buy the bizz. They need to know you havent borrowed it for example, or not beyond a certain percentage. Or obtained it illegally. Transferring it straight from a bank account in the UK to the US attorney who will hold it in escrow until the business closes out has its advantages as it is easy to prove provenance that way. We just put ours in a high interest bearing building society account. If you find a biz, you will need to move quickly as their may be competition so you dont want anything that you need to give loads of notice on.