Heads up - If your starting to make plans for that special someone this valentines day then Subway are running a National customer appreciation day on 14th February. It's nationwide and staff have been told no holidays that day as they expect to be busy.
You will receive a free 6" sub when you buy a 21oz drink or a 500ml bottle of water between 11am and 7pm.
In NI and ROI the offer runs "all day" (not just 11am-7pm).
I think water is about £1.20 a bottle and a 21oz drink £1.50 but prices may vary and all that....
"Terms and conditions - Get one free 6-inch Sub when you purchase a large (597ml) dispensed drink or 500ml bottle of water on 14th February 2017 between 11am - 7pm for stores in Great Britain. Available all day for stores in Northern Ireland and Republic of Ireland. Store opening times may vary. Not valid for double meat, extra cheese, or any other extras. Offer limited to one per customer per visit. May not be combined with any other offers or discounts. Offer available at SUBWAY® stores in the UK & Ireland only. Participation may vary."http://www.subway.com/en-gb/promotions/participating-stores-terms-conditions