Oh yes have done now for sevral years.. they're the exact same recipe, which is a great thing cuz often these things are not.. and they sell in pakcs of 4, and 8 at Iceland... and much cheaper than buying them in Greggs.. £3,,for 4.. £5 for 8... but also you can buy all the other pies they do like Steak Bake, Cheese & Onion Bake... ..I always have a few packs in my freezer even tho' I maybe only have a Greggs pie or sausage roll..once every few weeks, they're so handy to have..
..and remember they deliver if you don't have an Iceland near you....win, win !
https://www.iceland.co.uk/frozen/frozen-pies/greggs?start=0