I thought it was fairly clear the voucher is valid for a year (for both outbound and inbound travel) from the date it is issued. I didn't know about the having to complete all legs of the initial trip to use it bit (as you could potentially only finish that trip after 12 months). But in either case, you would need to complete travel by 2 July 2010. Another thing they may have forgotten to mention is that you earn miles (and tier miles) on such a ticket.