First impressions... it was a bit meh, nothing really popped for me.
Grammar issues all over the place, American English instead of British English, at least use British English for a British site.
It seems incomplete
There are extra links, additional colour combinations etc too
If you're going to use testimonials (I personally think they're pointless), they need to be real ones, yours read as if you wrote them yourself. Not to mention the bright agency worked with a different company according to their site...
The biggest issue for me is that it doesn't scream that you're a skilled web design company, there's no bells and whistles showing what you can do, it's all very basic.