If you were compiling a list of cycling events that could be readily marked down as 'endangered', there's a reasonable chance you'd include 12-hour time trialling in the UK. While it isn't quite in the one-event-per year bracket with its big sibling the '24', events are relatively few and far between.
Sprawling, unwieldy courses, onerous marshal requirements and limited numbers of riders up for the challenge are the most obvious issues that mean event numbers are stuck at around three per season – around half what it was 10 years ago.
