There will be 2 intervals but suspect the seats will be pretty uncomfortable and am starting to get sciatica (sp?) besides struggling to breathe because my lungs are so squashed - seems a shame to miss a bit of culture but then again, maybe I could pass the ticket on to someone else who will enjoy it more (and also not risk pissing off the people behind me by fidgeting throughout). what are your experiences of sitting through lengthy performances of one sort or another in v late pregnancy?!