yep that sums it up. Not sure if with respect to #2, they would have to pay you each month when the day falls, I know my place do, or if they would be allowed to just pay you for all when you come back although I'd imagine it would be when the day falls. Also, since that's the only pay you'd receive that month it should be tax free.
Whatever way it ends up you just need to be aware if your week 27 is coming out of you annual leave. You'll get paid for the bank hols one way or another but you don't want the shock of suddenly discovering that you're 5 days hols down, although you'll have accrued so many days that it probably won't be an issue, wasn't when I did it last time.
Best of luck with the bab, are you due in October or Novemeber? Oct 31st is my last day in before my leave starts, due #2 at the end of Nov so I'll be getting paid for the same bank hols as you...