Honestly not sure on this one.
Last night me and DH were at a big arena concert. We had chosen to sit rather than stand. I was so pleased we did as I injured my knee and would have not been able to stand for that length of time. The woman in front of us stood for the entire performance more or less. DH asked her if she would mind sitting as we couldn't see past her at all and she wasn't very polite when saying no.
What does Mumsnet think? Is it ok to stand when in a seated area of a venue and were we BU to ask her to sit?