Paying for each sitting
TfL's fee table lists the written exam at £225, for All London candidates only. Its booklet adds that the fee is due for each exam you sit, so a re-sit costs another £225.
Booking
You book and pay by contacting the Knowledge team. Give at least 48 hours' notice if you cannot attend; otherwise the fee is not refunded.
Keeping the cost down
The self-assessment after your first 80 runs is set out like the written exam and costs nothing, so it is a free look at the format. And a low score costs more than a second fee: it means a longer wait before you can sit again. See failing the written exam.
Sources
- TfL, Apply for a taxi driver licence, How much will my application cost?
- TfL, Introduction to the Knowledge of London, March 2022, page 10
From the guide: How long the Knowledge takes, and what it costs