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marcusjb
Looking more, I think it's a different Marcus that did the Maniac. There's a ride report here: https://yacf.co.uk/forum/index.php?topic=5212.0
Skimming through their posts from 2011 "I rode 600, 600, 1000, 600, 600, 1000 on consecutive weekends last year. I didn't die either."
I see you've already commented on this... https://crazyenglishtriathlete.wordpress.com/2011/12/27/cambrian-series-new-1000km-permanent/ might try and plot the route for that sometime out of curiosity...