Do I need a Public Notary Officer to certify document copies for my Thai visa application?

On a separate note: I had some trouble finding solicitors in the UK willing to certify copies of my documents for my visa application, and there seems to be some confusion here. The Thai Embassy Website states that copies must be certified by a Public Notary Officer or solicitor. My understanding is that this does not mean that the documents need to be certified by a PNO, merely by a solicitor, and the copies that I submitted which were certified by a solicitor were accepted. Therefore my advice would be to advise prospective solicitors that documents need to be certified, not notarised, and thus an official Public Notary Officer is not required.