Instructions:I am a Sun+ member but I believe this code can be used by anyone.. so though to share. You can just put this code on-line during checkout to get the discount. Doesn't ask for any Sun+ member related details.
I am aware of a similar deal posted for the today only online offer / Sun paper but this is total free and is added to the voucher section..also this is valid longer until the 31st July..
Hope this help.