U HAVE 10 MONTHS FROM THE STAMP DATE TO GO IN ONE OF THE ATTRACTIONS AND GET 1 WHOLE YEAR OF MERLIN ANNUAL PASS....MY VOUCHER IS STAMPED ON 24TH JULY 2012.................,,,SO U HAVE UP TILL 23RD MAY 2013 TO RENEW THIS VOUCHER....COLLECTION FROM WELLING STATION DA16.....OR WOOLWICH STATION ,,OR AROUND....I LIVE IN WELLING......