Instructions:[Update Monday 13/10: Coupon printed afresh in today's The Times 80p.]
Coupon printed in today's The Times newspaper Saturday 11 October 2008 (on page 49, paper costs £1.50).
"Present this voucher at a participating English Heritage property any day until November 8, 2008 and buy two admission tickets for the price of [the highest priced] one."
Excludes "Lulworth Castle in Dorset and York Bunker in Yorks."
Excludes "event days and bank holiday weekends"
"Vouchers are not valid in conjunction with guided tours, annual membership, family tickets, overseas visitor pass, any other discount or special offer."
They warn that some sites "close or operate reduced hours during winter, for details and opening times of all participating properties click on the link..."