Hey
I’m lookin for a trials unicycle in the uk, in a decent condition!
Any trials uni considered 
Spanner
Who are you calling a spanner, thats not going to get you anywhere 
Good luck finding one second hand.
Check out ebay, you may get lucky.
Your best off taking a look on Unicycle.com they have a huge range of unicycles and are great people. Give them a call if your not sure, there always happy to chat and give advise.