First up, sorry for the lack of PM, I was interrupted by work before I had chance to contact you, this is the fist chance I've had to write anything to explain, so apologies for my real life interrupting!
As Stu pointed out above, selling on behalf of third parties is not permitted! Its written clearly in the forum regulations as Stu mentioned above:
This rule replies to everyone, regardless of how long you've been a member and would also be enforced on moderators and admin alike. The for sale rules were introduced on request of the forum as a whole in an attempt to combat problem sellers and so far are working very well. I'm sure you can understand why the rules are there and that the moderator team cannot start making exceptions here and there; where exactly should we draw the line? The simple answer is there is no line to be drawn, we enforce the rules and make no exceptions!
Alastair.