You get a Galaxy Tab for only £15, subject to taking out a contract at the cost of £15, which includes 500Mb of data and apparently with no extra charge for exceeding data. Total cost over 24 months would be £375
The Tab retails for £372.30 on Amazon without data. Your paying extra for the data but with the added bonus of a very small upfront charge.
I thought it looked a good deal, although the data limits are a bit skimpy. Do they still do the free entertainment pack?