But didn't Boardman have his record (on the Burrows Lotus bike) recognised, and Obree (on his homemade washing machine special) not? I've lent the book to someone so I can't go and look it up.
As far as I remember, Obree set the first "modern" hour record, then Boardman beat it with his 56 and a bit KM, then Obree beat that. But the UCI changed the rules immediately after Obree's second attempt and said that any record should now be set on an old style track bike. No aero aids, nothing. Which meant that Obree's "superman" position was suddenly illegal, even though Boardman's record (which I think still stands) had been set using modern gear and an aero position.
All of this may be wrong.