I think the forum is a good idea.
The problem is though, an empty forum looks bad.
You need to try and get your friend to post some interesting articles etc in there to attract people to begin contributing.
Once the ball is rolling you will then need to keep a careful eye on what's posted.
I have friend with a Classic Saab, he will be interested in those forums if they get busy.
As for the design. It works. It's clean, it loads fast.
It is a bit sparse, but that's not necessarily a bad thing.
After a quick look, I would say...
Make the images in the links pages links themselves.
The images of the cars in the sales section look bad. They need to be better quality. Why not add value/interest by taking some interior or engine shots too? Show pics of the actual cars, not library shots (if that's what these are).
I'm at that page now. I want to buy the 2.0 Aero HOT. What do I do? There is no contact info on the page, no links, nothing.
Add some pics to the Accessories section. People in the market for car mods like eye candy! Show some of the accessories and explain their benefits etc. There's a lot of potential in that section. Which reminds me.. anywhere you say "contact us" make it a link to the contact us page.
Generally, get some nice pictures on the site.
From an SEO perspective...
Get the words "South Wales' Saab Specialists" into an <h1> tag somwhere!
There will be more to do here.. no time now!
From a coding perspective...
Using CSS.. good!
Semantic markup (from what I've seen).. good
You are close to making this site valid XHTML. Look into adding DOCTYPES and making all tags lowercase and quotes around all attributes etc. Not essential, but it will put the cherry on the cake.. and you are so close!
Got to go and do some work now.
Well done though. Nice job.
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