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They need closed roads to stop the triathletes hurting other vehicles. ;)
They normally have bigger fields for the Nationals so there's a bit more 'stuff' to pay for. As skinny said, often require a sports centre or something as the normal halls won't cope. Probably have to measure the course a few extra times... too soon?
Actually, I wonder if there's more marshalling required?
Maybe they'll have some nice cakes for you?
true, last race was IM UK, which was about £400, but then I had 180k of closed roads on the bike and another 42k for the run, plus feed stations all the way around, the cash is a bit easier to see!