In 1960, 3d was the standard child fare on an Edinburgh bus, 6d for adults. I remember my grandmother once showed me a silver thruppence, but I don't remember what it looked like. But here's a site with more info.
I'm pretty sure I remember seeing a silver 1.25p piece when I was very young, but I don't think we still had them for the Christmas pudding. I expect INJ had eaten them all.