Freecycle: Shimano levers, two stems, leanback seatpost and a stem-bar combo

What size is the seatpost? And would you be able to give it to someone at Cambridge polo, who's going to the bristol tourney?

Just measured it and it's something like a 25-26mm in dimater. French size maybe?
Passing it on to someone to pass it on to you, sounds waaaaay to much hassle, id rather just stick in the envelope and post it to you.