Your main url should go to
http://www.turnarcades.co.uk/TurnarcadesMain.htm and should have a picture of a machine on it. The first page you have now looks like a personal website. You might also want to decide if you are a we or a me, as your website is inconsistent about that.
All the pictures under cabinet info should go, they do more harm than good. Pictures of unfinished cabinets sitting out in your backyard or in your computer room totally breaks the company illusion that you are otherwise trying to create here.
Also, this has nothing to do with the website, but why do all your control panels have 8 admin buttons on the front of the panel where the user will invariably bump into them. That is a design flaw my friend and a huge one at that. I like the rest of your main design otherwise, it is very atari. Also, I know you are probably doing this to reduce costs, but the monitors on most of your machines are too small. A 21" computer monitor is the same size as a 19" arcade monitor.
I would also suggest getting rid of those renderings of "the cocktail" "the king" and "the supreme". It makes it really obvious that you have never actually built those machines and no one wants to order the first one.
Also, for "The king" I suggest closely examining pictures of american 4 player cabinets, as yours closely resembles a Defender cabinet with a homemade frankenpanel grafted on. Pay close attention to the design of the control panel itself and how it interacts with the rest of the machine. I would also REALLY suggest that you don't sell a 4 players cabinet without a 25" monitor in it.
The supreme. Why does this have a widescreen display? No arcade games did, and thus everything will be wrong, 100 percent of games will be wrong. On the plus side the control panel looks pretty much spot-on. May want to examine some american showcase cabinets for the rear section though, as your design looks more complex than needed and is sort of funny looking.