Wilko was brilliant when he did guest of honour / hander outer of 'stuff' plus excellent talk. Mike Hall, Shu P would also be great choices just to name a couple of ultra distance bike riders.
never heard of any of them
Some of the most accomplished long distance riders around.
Wilko - several times national 24hr champion and record holder at the event (541 miles)
Mike Hall - held the record for round the world (91-92 days) before the rules change, won Tour divide and TransAm and organises TransCon
Shu - britain's first female solo RAAM finisher
(I have probably missed loads off each of their palmares - sorry!).
I think all three are AUK members, but all have taken their long distance cycling in some amazing inspirational directions.
Wilko was great 3-4 years ago.
Good choices for future invitations.