want to switch to o2 DSL

I am unhappy with the constant internet downtime I'm getting with my current DSL provider, and want to switch to someone else. I am considering o2 as I'm already an o2 mobile customer. I only have until 28th August (2 days!) to cancel, otherwise it will automatically renew on 28 October for another year. So I have 2 questions:

1. How long does it take from ordering o2 DSL/Home Phone to getting it activated? I want to keep the same landline number too, and I don't want service interruption
2. Is there a nice deal that will include mobile and home internet plus home phone?

Cheers!