I am so incredibly grateful to some of these comments about 70s upbringings, I've had a real epithany.
I've been feeling like, as a PP said, a terrible person because I don't want to hug and comfort my elderly parents (especially my mother). I'm doing my bit, in fact I'm spending hours and hours a week on sorting stuff out for them, but I'm doing it as a duty or job rather than with any love or tenderness.
When I go to them, as I do more often than I want to, (a good 1.5 hours away), my mother wants me to sit down and chat while I just want to get on with the myriad stuff she can't do herself. Mostly what I feel is impatience, frustration and irritation. And then guilt. In fact I'd say guilt and resentment is the toxic combination of feelings.
And my parents weren't bad parents. They love and loved us, I've no doubt. But they were incredibly hands-off. Nannies, boarding schools for my brothers, few holidays together. Benign neglect, I guess. They only engaged with from our late teens when we became interesting. It's so part of their age and class that I accept it, but their total lack of interest in my children or being grandparents, except in ways my mother could talk to her friends about, really brought it home to me. They laughed at my MIL for playing snakes and ladders with mine when they were little, saying things like 'it's so sweet that she enjoys it'. Not understanding that nobody loves snakes and ladders, we just love engaging with small children in whatever way we can.
Anyway, this is kind of irrelevant to the OP but I'm just so relieved to have what I felt were my callous feelings expressed by others in a way that makes me feel like I'm not horrible. I realise that if you weren't cared for as a small child in a warm, effusive way, then you can't care for them back in that way, even if it's something they now want.