Instructions:Got this through on my O2 gold surprise. If I have had known I could have got it for free I would have picked another option.
Non the less perhaps useful for someone else. Looking at the terms it does say 1 per party so I suggest doing it solo :P
"Valid 2nd August - October 31st 2010
1 main course burger or salad purchased qualifies for a free junior menu meal (excludes small burgers).
Not to be used in conjunction with any other offer. Valid in the UK only. 1 voucher per party. Please present this voucher when ordering. Eat in & takeaway."