Turkey, trimmings and lots of cranberry sauce, and again later in a sandwich I hope.
I remember capons very well. When I was growing up that was always our Christmas Dinner, with roast pork on Boxing Day. I don't remember having turkey, other than the inevitable work lunches, until I was married and started doing Christmas myself.
Basically a capon is a castrated cockerel. Bred for the table. It was mainly done chemically. And that genuinely was banned in the 70s. But maybe Dai the Chop did em surgically in your neck of the woods Min. That was never banned to my knowledge but it must be a tricky manoeuvre.
The banning of the chemical treatment is why they're no longer standard Christmas fayre.