New mobile phone laws

With the revised laws about mobile phones and driving I thought I should check and make sure that the wired ear piece i use while in the Mini was up to the legal requirements.
I went into my local O2 retailer thinking they should be able to give me some useful advise, the young chap at the counter told me that the ear piece i was using was not up to the legal requirements because it had a wire and i need to have a bluetooth ear piece or car kit and they start at £19.95. After much consideration and nearly parting with £50 i decided to go back to the office and look on the Internet for a car kit which was best suited to my needs.
During my searching I looked up the law about using mobile phones in cars I was very surprised to learn that my ear piece complyed with the law and also if the phone is in a cradle i am allowed to press the receive button http://www.opsi.gov.uk/si/si2003/20032695.htm.
The morale of the story I guess is never trust a sales person there job is to sell you something not to give you advice which will probably result in them losing a sale.