I've not dayseated for either of these shows, but 7am sounds like a fine, if somewhat early, time. Neither of these shows are epic sell-outs in tiny, exclusive venues (why hello there, Donmar Warehouse!), and I don't believe the dayseats are as bargaintastic as others (oh,
All My Sons, I didn't see you there!), so - and please forgive me if I'm wrong - I reckon you could give yourself an extra hour or so in bed. Especially for
Flashdance (the Shaftesbury is both huge and out-of-the-way).