I will ask Debbie anyway, she might know something and it might shine a very little light on the subject
Your quest is a very noble one Carl and if I can help I will.
I'm sure if you badger this guy some more he might give in. The danger is he'll hold out as he knows he's got something special - unless he does already!
I guess if you got to see some pictures it would be a start, you could then at least work out the authentisity/history of the bike.
All i can pass on, is he says its not rotten, but its in a shameful state (his words) it was his sons bike bought in Bristol, when a student, came with two forks, both painted the same colour.... Zebra, its not complete, and he says hammered.
Hence why i think he doesnt have much interest in it. he wants shot of it for space reasons, but apparantly darent do anything untill he speaks to his son...
He thinks he can see a sticker that says 653.....
It does all make sense to me, the Pioneer did progress i know this much for sure, it all sounds right ref suspension too.....so im just chasing a rainbow for a minute, but i live in hope.
What really sparks the interest is his ref to the "PR1" i have heard this reffered to many times by different people over the years.
Basically an Evolution of the Pioneer.
Perhaps the Pioneer for the 90s....