Gibbs

The mail function should be:
 
mail($to, $subject, $message, $headers); In your case:
 
mail($emailTo, $subject, $body, $headers);  
Rename $headers to $subject
 
Your new $headers should be:
 
$headers = 'From: whatever@whatever';  
Edit: For example:
 
if(!isset($hasError)) { $emailTo = 'contact@r-m-t.org.uk'; $body = "Name: $name \n\n Email: $email \n\n Contact No.: $number \n\nPost Code: $postcode \n\n Message:\n $message"; $subject = 'Website Contact Form'; $headers = 'From: whatever@whatever'; mail($emailTo, $subject, $body, $headers); $emailSent = true; }  
Check out http://php.net/manual/en/function.mail.php#example-3374