My mother's mom was from Ireland; Pop was a mutt with an absolutely fucked up upbeinging, so no idea! But my mom and her brother, as well as her 40 first cousins, all drink Lipton tea with milk. They just love basic tea with milk. No sugar, nothing, just black water with milk in it. I bring up the heritage because I assume it's something they brought over, because outside of my family I don't know many people who put milk in tea.
I'm a black coffee with a little stevia guy myself. Wife got me into stevia and it placebo's away the heartburn I got from just drinking straight black.