Many moons ago @El_Diablo very kindly freecycled a tandem frame and fork. His original post and the history of the bike is here: https://www.lfgss.com/conversations/149191/#comment6613602 but it should be noted that it is two frames welded together.
One of the requests was that it shouldn't be left as a 'project' so after moving city and the loss of a stocker it looks like it's time to pass it to the next person. At the moment it has two wheels, saddles, headset, derailleurs and bottom brackets.
Collect from Brighton (Hove Actually).
It's miserable weather outside but I can get some pictures on request.