I've got a Diago Showman for sale if you're still interested in one.
It's been gigged but is in pretty good condition, some of the covering cloth is a bit marked, but nothing too bad and the internal carpet for attaching pedals is in good condition.
I've replaced the handle with a much stronger one after I went through two sets of the original handle brackets - they cracked due to the weight of the loaded pedal board and pedals. (Diago replaced them both times free, but I really don't think they are up to the job). I replaced it with a much more sturdy (and comfortable!) leather handle, which has been great.
I'm after £50 collected from Haywards Heath. Whereabouts are you?