Keep on moving
Googling for information on using SSL for security and complying with the data protection act is (a) very boring and (b) very difficult because you get zillions of people's privacy policies. All of the official stuff I have found so far is maddeningly unclear, and even my bank just says "Yes, we use SSL, it's the industry standard."

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However, as it is Friday afternoon, I shall do exactly what I have just said you shouldn't, and look at the act and, not being a lawyer, make a bizarre and arbitrary and probably inaccurate summise that the most relevant bit is Schedule II Section 4 (d) does not involve disclosure of the personal data to a third party without the consent of the data subject.
You could perhaps argue that not using SSL could potentially cause this to be contravened, and that by using SSL you are at least trying, though obviously the Act does not have any helpful exemptions for holes in the operating system etc. etc. :-)
I hope the above is taken in the spirit in which it is meant i.e. I am trying to be vaguely helpful, not sarcastic...
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