Cheers, just a quick note for others interested:
from the t-mobile website:
To start using one of them simply pop it into an unlocked handset and activate by topping up with £5 or more
We will send you a text to confirm your 1000 FREE texts have been loaded and are available to use over the next 90 days
To receive up to £100 FREE credit just use £10 per month and we will give you £10 FREE credit back for 10 months!
Give your second FREE SIM to a mate and take advantage of the Mates Rates calls and text 5p rates
The SIMs MUST BE ACTIVATED BEFORE 31st December.