Eating through my broadband usage

[#1]

I've been working from home this month and as I've been preparing a photo website I was horrified to see I've used nearly 17GB of paid-for broadband and nearly 20GB in total.
I'm on PlusNet Broadband Your Way Option 3 (Monthly Contract) which includes "up to 30GB". I'm praying that my broadband speed won't get hobbled - or worse - as I have to get a new release out this week. 
Am I going to be OK? My month runs from 12th to 12th.
What do you think?
Pete.

[#2]

Hey - I noticed this thread too. -  Usage limit worry at 1100.
When do the limits cut in? I seem to remember abut 2 years ago I used 1/2 my allowance then my speeds dropped alarmingly.
Where is all this documented?

[#3]

That doesn't happen on Broadband Your Way Dizzley.
I suspect you're thinking about Broadband Premier where restrictions apply after 13GB:  http://www.plus.net/support/broadband/products/archive/bb_premier1.shtml

[#4]

Thanks James.
Yes. I used to be on Broadband Premier. That's one thing which convinced me to change.
Sighs with relief and starts a torrent download..