I have an Oyster card which nowadays I only use on the rare occasions when I need to travel outside the hours permitted by my Freedom Pass. This happened last Monday when I needed to travel from Greenwich to Abbey Wood before 9.30am. My journey history shows £10.40 deducted when tapping in at Greenwich at 8.19am then £6.80 being credited when I tapped out at Abbey Wood at 8.51am resulting in a correct payment of £3.60 for the journey. But where does the figure of £10.40 come from? Thank you if you can answer this. I have tried looking for an answer but just got myself confused about minimum charges and maximum charges.