I'll assume from your post you don't need help getting the pound-sterling symbol ahead of the numbers.
If your installation of PHP has perl-compatible regular expressions enabled, here's a snippet that will put commas in numbers:
[tt]<?php
$foo = 350000;
$foo = strrev ($foo);
$foo = preg_replace ("/(\d\d\d)(?=\d)(?!\d*\.)/", "\\1,", $foo);
$foo = strrev ($foo);
print $foo;
?>[/tt] ______________________________________________________________________
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