conversion from html to php problem

Hello

Many thanks you for your time,

My website www.driversscotland.co.uk was checked in W3C for Validation
revealing at first 9 or 12 errors.
I decided to us the HTML Tidy, and took the revised HTML to convert to php.
Upon Revalidating I have received the following message which I feel perhaps
contradicts the point of HTML Tidy and still leaves me with a problem. (I
used Yellowpipe Internet Services to convert)
I am very new to this and have reached my boundries of knowledge and ability
I'm afraid. I hope you can help.
What will be my next step or can you fix with a simple piece of coding?
See below...

 Message:

   1. [image: Error]

   Sorry, I am unable to validate this document because on line *216* it
   contained one or more bytes that I cannot interpret as utf-8 (in other
   words, the bytes found are not valid values in the specified Character
   Encoding). Please check both the content of the file and the character
   encoding indication.

   The error was: utf8 "\xA3" does not map to Unicode



   Kind Regards
   Stuart Robertson