I have an Advance ticket purchased from GWR that was routed 'via Reading and London'. (Lympstone to Crossflatts). The itinerary mentions London Underground to transfer between Paddington and Kings Cross, but there is no dagger or cross shown anywhere I can see on the ticket - I assumed it was going to be valid on the tube for the transfer, but apparently this is not the case. Is this correct? Are the LU connections no longer included in the price?