We understand after the last 2 years, many vouchers could not be used, you can simply visit www.buyagift.com/extension and extend your voucher for £20.
To check if your voucher can still be extended please log in to The My voucher site using your voucher reference details.
The only time this won't work is if the particular experience is no longer available. In this case please get in touch with us and we'll issue you a credit voucher.