Thanks, Mike. That’s really. helpful.

Here’s the travel from the day costing £9.40 – having read your comments I’m now assuming that it’s because I used Barking when travelling from Crouch Hill to Fenchurch Street. I should have specified that!

18:33 Bus journey, route W7 £0.00
18:12 – 18:32 Farringdon to Finsbury Park [London Underground/National Rail] £2.60
17:45 – 17:54 Aldgate to Farringdon £2.50
08:05 – 09:05 Crouch Hill to Fenchurch Street [National Rail] £4.30

I didn’t realise Stratford had a pink reader, but come to think of it that makes sense. Assuming it’s by the overground platforms?