Important: Whenever you buy a gift voucher for use in the future, there is always a risk of businesses not being around for you to redeem it. We will try to include T&Cs related to this where we can. NB This is no reflection on the retailers included in this post What are my rights with gift vouchers and cards?
Works now for all for Black Friday gifts. Just received by email. Vouchers valid for 20 months ie till 2022.