I line in zone 2 and have an oyster card PAYG and can travel to Egham from 1. either Finchley Road and Frognal, changing at Richmond or 2. Finchley Road tube via Waterloo, and then on to Egham. Either way I leave zone 6 after Feltham. Can you tell me - with PAYG do I really have to leave the train at Feltham, touch out and then get the next train to Egham, adding 20 mins onto my journey? Then do the same on the return journey in order to touch in? And would I have to do the same if I had a London zone travelcard on my oyster card? Many thanks for your help.