Hi,
One of FT's ad serving modules is delivering ads from a company called hotcrazydeals.com. The ad promises:
£4.00 instead of £30.00 for credits on your Oyster card
It's probably going too far to call them scam artists, but this is basically a dupe to get you to enter your credit card details, you then get billed for a 'membership fee' if you don't cancel within 72 hours. I haven't gotten as far as trying to sign up, as I wouldn't trust a company "registered in Panama" with such sensitive info.
I don't think FT should be displaying ads from companies like these.