Thank you everyone.
I had expected the death and funeral to be the easy bit, as I effectively lost my mother 10 years ago. But by my new stress measure - number of Gaviscon tablets consumed per day - it took its toll.
The funeral went well and the Gaviscon tables are now packed away. It is difficult when someone is very elderly and lost interest in doing anything outside a strict routine, but there was a good showing of people who had been friendly with my parents, when both were well. I came close to losing it when my patronising SiL congratulated me on how well I had looked after my mother, ignoring the fact that she and my brother chose not to help me, but hey, I have kept my cool so far though I am not certain whether, once probate is done, I will ever want to see them again.
An odder one is whether we continue visiting the coastal town she lived in. We will have visited at least every couple of weeks, and to make it manageable we bought a small flat down there, and started supporting the local football team. DD spent a summer doing work experience there and one Easter DS spent mornings revising and afternoons shifting furniture. DH seems to assume that we will continue to spend weekends there. Apparently you can't change football allegiances quickly. DD, who used to moan about being dragged away from London, is now talking of applying to the local hospital for FY1. I am less sure, though have met some wonderful and supportive people. I guess I need more time before deciding what to do now we have an empty nest.
I agree with Xenia, lawyers can have a role. Their focus, alongside earning fees, seems to be to keep the taxman and all the heirs happy. So in circumstances where there are family tensions or insufficient capacity to do the paperwork, having someone neutral to steer the process is useful.
Other than that DD seems really happy. She is lucky that the course is longer as she does not seem to be in any hurry to leave University.