Little Nell - The stadium is terrific and they're pointing the finishing touches to it now. The "eye-line" is much better and spectators will get a better view of the pitch. Atmosphere may not be as good because seating not close to the pitch but more spectators. Can't imagine how they're going to control 60,000 football fans going through Westfield shopping Centre though!!
The stress that you're putting yourself under to beat PB's is counter productive. It will sap your energy much more that you think and you certainly wont be able to run freely/relaxed which is what you must be able to do to run your best.
"I attempted a flat half marathon last month but had to drop out due to looking at my watch too much and becoming anxious about my pace".
That really is serious. Do a few runs without the watch and run as you feel its great.
Finally you don't have to bust a gut on every training run! Quality over quantity.
I'd go back to 4 days a week as clearly with your job demands you havent got the energy to do 5 good ones and way. Just my opinion.