For commuting I have a Leagrave - Hendon season ticket. Occasionally I need to travel elsewhere in London so might extend this with a Hendon - Zone 1-6 Travelcard, as I did today. It is usually obvious whether I need to buy a peak or off-peak travelcard but when it is on the cusp of the change from peak to off-peak I am not entirely clear. For example: 09:13 Leagrave - St Pancras is a peak train from Leagrave but is off-peak were one to board it at St Albans (or indeed Harpenden or Luton Airport Parkway). So, to travel on this train from Leagrave - St Pancras would I need to buy a peak or an off-peak travelcard to extend my journey beyond Hendon? Were I to board this same service at St Albans (say, by travelling on the 08:59 from LEA) then I am sure an off-peak travelcard would be fine since I would be boarding an off-peak train at SAC. But, by travelling from LEA - STP entirely on the 09:13, would I, by virtue of it being a peak train from LEA, be required to have a peak travelcard to extend my season ticket beyond HEN?