MsD, I said earlier that I'm not angry about the situation, so it's not a matter of me thinking CM has been rude. Canvassing opinions here (and yes, I am genuinely seeking other people's views, not just to confirm my own!) has made me see that it's a more subtle issue than I'd originally thought.
I suppose the best analogy I can think of is that it feels a bit like your partner popping out to the shops for half an hour but not telling you. So you think they're indoors but they're not actually around. It's not the end of the world, but just feels a bit...well, odd.
30 minutes' drive for some people isn't that long but I think we've established on this thread that that totally depends on where you live.
I have learned one thing from this thread which pertains to my CM situation. Some people on this thread made incorrect assumptions about my relationship with my CM, assuming that I don't trust her. Our brains do this as a matter of course, they're wired to 'fill in the gaps' so that life makes sense to us. As we all know, though, assumption is regularly the mother of all -
Similarly I had assumed that most parents would want to have their CM mention (and I mean mention, not some kind of formalised advance warning) that they're taking their child somewhere out of their locality. Clearly for some of you this isn't an issue, so I was wrong to assume about this. I still think it's okay to ask the CM to let me know about such trips, and I know that on this thread some people feel the same way and some don't. That's allowed, isn't it! We don't all have to think the same way about everything. I can see that the problem has been caused by me assuming rather than talking about it with my CM.
It's not been particularly nice for me to be on the receiving end of incorrect assumptions on this thread, particularly when it's resulted in some posters being pretty unpleasant. Thankfully I haven't been unpleasant to my CM about my own assumptions, and I'm certainly not too big to apologise so I'll give her a call and sort it all out.
Thanks again for your thoughts, despite some false assumptions and nasty comments, it has been useful!!