I grew up with Bisto, too. My late stepdad was English ( @Ted Fairhead), and his mum would bring boxes over when she came once a year. We finally started being able to get it in local stores. My mom insists that the granules aren't as good as the powder, so I get the powder for her when I can. I can't tell the difference. I do like Bisto and still use it. Usually I make my own gravy, but it provides a 'boost' of color and flavor and it beats extra flour as a thickener.
I also happily save gravy in the fridge or freezer. To me, gravy is the point of roasting a piece of beef or chicken and tossing it is horrifying! I have made a meal of rice and gravy or even bread and gravy!