Which gift card should you give a Time Lord?

Emerging from his confession dial after 2 billion years, the Doctor's relief at returning home to Galifry must have been tinged with concern over his gift cards. Would they have expired? Well of course, it depends on which ones he has.

Amazon's 10 year gift card, despite being one of the most enduring, is no use to the Doctor. However, there are some gift cards that never expire:

Selfridges, Google Play, and TK Maxx plastic gift cards last forever. Theatre Tokens are paper vouchers which have no expiry date, and if you trade in an item at CEX, their vouchers have one thousand year expiry though that is presented as endless.

Marks & Spencers paper gift vouchers never expire. I have some twenty year old vouchers which are still being honoured. Not to be outdone, John Lewis and Boots paper vouchers will also never let you down. However, none of these paper vouchers can be obtained from the retailer any longer, and some stores ask you to send paper vouchers to customer services who exchange them for gift cards.