Messaged her, got a positive reply. She sounded really keen, which I took to be an optimistic sign. Her profile has only been up for just over a month so I kidded myself she hasn't become jaded yet (and why her hourly rate is £100 for a (supposedly) 25 year old student).
She sent me a mobile phone number and promised to send her postcode on the day. Of course she didn't. On the plus side she didn't send me on a wild goose chase and I didn't lose anything but it did confirm that if it looks too good to be true it probably is.