SSL and HTTPS on my legal club site

I have a SSL certificate and have installed this plugin WP Force SSL. I have also added https to the WordPress Address (URL) and Site Address (URL) parameters under General > Settings.
This has all worked great.
My problem is that the links within text/images on pages e.g. on page the contact us links which are on over 50 pages, plus the image links still have http and therefore don't work.
I don't want to have to try and find all the links throughout the site, is there an easier way to change them all to https?
Thanks in advance