Just me, adult, no railcard. Age 39 and a half. Travelling down Friday afternoon to arrive in time for tea, travelling back as late as possible Saturday afternoon. Don't mind fixed times outward, would prefer flexibility back but realise I can't have both. If I can leave Gravesend flexibly and wait at Pancakes or Kings Cross, that should be fine. Cheapest walk up I can find is 103. An alternative that I need to investigate is the possibility of travelling to Aylesford to overnight and returning with BoJ at Gravesend. Any ideas? I have Clubcard points and Nectar points if I have to pay in advance, or a stack of RTVs if I can pay on the day.