EDIT: Points will not expire unless you don't use your card in 12 months, so plenty of time to claim! Points also work on everything else at Subway (so if you collected 400 points from before that makes it a free sub)!
100 points will be added to all cards in order to claim a free hot drink at Subway. Simply scan your Subcard to claim your drink! Got this in an email from Subway, don't think this will be account specific as these freebie Subway deals are usually not. This and free by Costa tomorrow