Legal disclaimers are a real hot topic at the moment.
As a UK business you need to look at our EU regulations.
I would never advise anyone to go live without policies and disclaimers but there is no common wording that I've found.
Your policy should include things like:
We will not share, trade or rent your details with any third party.
However we may from time to time send you information of products, services or information from third parties.
You will be able to remove yourself from our list(s) at anytime using our automated control panel located here: <link>
It will be treated in accordance with the legal provisions under English law concerning data protection and may be initially stored and processed inside or outside the European Union anywhere in the world.
You agree to indemnify us against all loss howsoever caused.
This policy will be governs by the laws of England and Wales.
Having just wrote that I now need to inform you that I do not in any way represent that the information you have read is acurate and as such I recommend that you seek the advice of a qualified legal beagle.
Hope that sends you on the right track
Kev