I have cracked it!!!!
Code:
<?php
$email = $_REQUEST['email'] ;
$yourmessage = $_REQUEST['yourmessage'] ;
$name = $_REQUEST['name'] ;
$address = $_REQUEST['address'] ;
$postcode = $_REQUEST['postcode'] ;
$phoneno = $_REQUEST['phoneno'] ;
$actual_message = $yourmessage."\n--------------------\n".$name."\n".$address."\n".$postcode."\n".$phoneno."\n" ;
mail( "myname@btinternet.com", "Feedback Form Results",
"$actual_message", "From: $email");
header( "Location: http://www.mydomain.co.uk/contact_thanks.html" );
?>
Did it by putting all the parameters into $actual_message, and then adding that to mail.
Thanks for your help, Alex