I don't think you've ever tried dealing with the OFT.
Glacial would imply an excess of speed and action on their part.
Scam companies regularly set up, flout the legislation and the OFT 'guidelines' (which is what they are so a breach needs to be investigated before it can become subject to enforcement - more delay) and keep going until the OFT eventually acts then collapse to run off with the money.
Normally local trading standards units are much quicker at taking action but have limited powers and some things are reserved for OFT (see Glacial, above).
It has taken years of complaints to the OFT about mobile phone companies hiking 'fixed price' contracts mid-term for any investigation to be done (small print says 'fixed price' is index linked to whatever index they choose to apply an increase with). The investigation is still ongoing and although there is talk of action, it's not actualy happened yet, despite this being one of the most significant causes of complaints about mobile phone contracts for many years. [http://www.bbc.co.uk/programmes/b006mg74/features/mobile-con...]
Action on a scam site doing auto-subscribe ? I wouldn't hold my breath regardless of whether it is legal or not.