Changing to Unlimited - before or after October 22nd?

[#1]

I have had a search through the forums, and found this on the help pages too.
I want to change from BBYW Option 2 to Plusnet Unlimited (I'm exceeding my usage allowance (mainly through streaming iPlayer etc), and have had to bump it up by several pounds over the past couple of months), but I don't want to get stuck in a 12 (or even 18) month contract as I might be moving house in the next year (probably staying with Plusnet).  I'm on a market 3 exchange and have home phone "Talk Evenings & Weekends" with Plusnet too.
Given that the T&Cs are changing on October 22nd, what do I lose (if anything) if I change package BEFORE then?  Is there a good reason to wait till after October 22nd?
Thanks.

[#2]

Hi,
There's no good reason for you not to change before October 22nd.  The changes in terms and conditions will happen regardless of whether you change your product sooner rather than later.
If you do schedule a product change and then change your mind, let me know and I'll sort it out for you.