This was my code. Not sure if it's unique or not but give it a shot if anyone hasn't got one and let us know if yours is different or not
Just claimed mine
Click on the link you posted and read the terms and conditions. It says offer valid till 10th Nov 2017. :D Must be old T&Cs.
Not sure where you saw that as nothing is stated on the email apart from use it on 15th June this year
Voucher is valid till 10th November 2017? (horror)