Solid down to earth recipe as always, but for that authentic British pub, steak and ale pie flavour you’re going to need to add a good splash of Lee & Perrins Worcestershire Sauce to that stew.
In Britain we normally use the word 'dripping' rather than 'tallow' for culinary meat fat. My grandma used to have bowls of beef, pork and lamb dripping - never mixed. 'Tallow' is, or was, used for the animal fat that cheap candles were made from for people who couldn't afford beeswax candles.
if you're using a bitter beer like an IPA you can counteract the bitterness with a squeeze of honey, you get some of the best results that way, stouts like guinness work great too.