Links not showing the blog posts

http://www.sproutfilms.co.uk
(I think this may also be theme related)
My client has sent me this site to fix. It’s pulling in the blog items into the front page. But as you can see when you click on the first post, it pulls a 404 error as it can’t find the right page.

There is a a bunch of redirects that weren’t created by me:

Options +FollowSymLinks
RewriteEngine On

RewriteRule ^$ index.php [L]
RewriteRule ^index.html$ index.php?p=1 [L]
RewriteRule ^our-services.html$ index.php?p=3 [L]
RewriteRule ^our-clients.html$ index.php?p=4 [L]
RewriteRule ^testimonials.html$ index.php?p=5 [L]
RewriteRule ^who-we-are.html$ index.php?p=6 [L]
RewriteRule ^contact-us.html$ index.php?p=7 [L]

RewriteRule ^news.html$ index.php?p=2 [L]
RewriteRule ^news/(.*)$ index.php?p=2&n=$1 [L]
# BEGIN WordPress

# END WordPress
16:17
I strongly suspect it’s the theme that’s currently applied, but I’m not sure what to do with it.

If anyone can help I would be most grateful as I’ve been going slowly crazy for over a week now with it.

It seems the client wants a mix of static pages and wordpress content, but I just can’t pinpoint what link is supposed to go in there to make it work.

Please, if you have time, have a look at the site and let me know what’s wrong with it. Many thanks!

[No bumping. If it’s that urgent, consider hiring someone.]