HI Mark,
What CMS is your Previous version of site ? Is it wordpress or using PHP. If you find yourself in a situation where you need to redirect a PHP web page that is outside your WordPress installation, you can use a PHP redirect.
PHP redirect.
You can redirect a PHP page by adding this line of code to the header:
header("HTTP/1.1 301 Moved Permanently");
header("Location: http://www.yournewwebsite.com");
?>
Note that the “301 Moved Permanently” line is necessary to advise search engines that you are using a 301 redirection. You also need to ensure that this code is placed at the top of the page to ensure the redirection works correctly.
If you would like to use redirection within a theme or plugin you are developing, you can use the WordPress wp_redirect function.
Redirect a Page Using a WordPress Plugin:
One easy solution is Quick Page/Post Redirect Plugin. The plugin allows you to perform 301, 302, 307, or meta refresh redirects. Redirection is a another great plugin that features 404 page monitoring. It will show you exactly what pages are generating 404 page errors and allow you to create 301, 302, and 307 redirects, for each of those links.