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Agree, website functionality for booking is a PITA. If it helps, my workaround, is to look at the track calendar to see what is on and when, before using the system to book the session I want.
https://www.visitleevalley.org.uk/en/content/cms/london2012/velo-park/#track
Its not a direct link, as the pdf changes each month, but the link is on the third row
have also run a garmin hub speed sensor no problem