I got a "ticket alert" email from East Coast informing me I can now make a reservation for Aug.1. I tried and got a notice that it is not available. And if I tried and sign up for another alert, it tells me the tickets are already available. However, I tried with going from Euston to Waverley, and no problem. Does this mean the tickets are already sold out? Should I just buy the ticket going from Euston but hop on at Kings Cross? Any insight is much appreciated.