Daytripfinder.co.uk has currently got an offer listed which allows 1 free entry when you buy 2 full gate price tickets (£19.50 or £16.50). The cheapest ticket will be given free.
To take advantage of this offer you need to click here and print the voucher and take it with you on the day of your visit.
This offer expires on July 1, 2014.
For full details and to print the voucher visit the Daytripfinder website.
There is no specific end date for when this printable voucher will be available until so if you try to print it and it is not there please let us know through our comments form.