Hi Bagpuss
I'm not quite as far as you but my little one also tends to kick very low, so I know exactly what you mean, not always on the bone but I get alot of kicks against what feels like the wall of my vagina (so if tmi) they alway shock me and do feel quite vigerous.
when I first felt it it really shocked me as this is my third pregnancy but the first time I've felt kicks there.
It's nice to know that it's not just me