Design and color combination of the site is really looking cool. I like the design you have made, very good work
I like the layout, I think You should change the lime green title links to the dark green and when they click it goes to the lime green.
You need to get custom logo's for both the sites - and if they're part of a joint venture, I suggest that the designs you use are similar if not the same. I would also suggest adding an image to each of your blog posts to easily communicate a message visually, which is quicker and easier for your readers. Try to format your text better, using headings and paragraphing more often. Right now it clearly looks like keyword-optimised text. There's also some CSS error, where (on the .co.uk site) on the right hand side column, there's a bit of text that overlaps into the main body of the site. Hope this helps