I will be spending two nights in London next week with only early evening
engagements (in Westminster) so I fancy a bit of gricing during the day on
Monday and/or Tuesday. I will have a bike with me but it could be the
folding one.

I could use Oyster but I fear exceeding maximum journey times. I don't
plan to go outside zones 1-3.

Would a Cambridge-Zones 1-3 Off Peak Return do the job? It might be Zones
1-4.

I can't find the ticket online (FCC only do Zones 1 & 2 and East Coast
only have one via Tottenham Hale) but I pretty sure they exist and have
bought one in the past. I can't find the same fare on other webtis sites,
Southern at least (Chiltern is down as I write). FCC have a zone 2 return
at the same fare as the East Coast U123 option. I'll pop down the station
later.

--
Colin Rosenstiel