Hey Alastair
This has come a fair way there are still a couple of things that need some work so I'll use the notes...
Well I hope this helps, good Luck!

if the chicks' head is going to be that high, make the header same height
careful with headings watch your line height
the gap here is smaller than the gap under it which is massive
body font would look better if it was different to that of headings
this seems to be just floating here, and the kerning is really tight, loosen it up a bit
is a bit weak, it would look better, based on the fact that you are web designers to add more content into it in fact the areas above could be brought into the footer
Hi Aaran. Thanks very much for your critique. I will definitely look at the areas you've highlighted and make some changes.
Hi Alastair,
i think the spacing between the bottom boxes is to big. Maybe it works better than you seperating the boxes more from the header.
Align the text in the header on ne the right side below the image to the baseline of the text an the left side.
The green font lacks a bit of contrast and is hard to read.
It is very clean and easy to read. It does lack color because it's mostly blk/wht. The pictures at the bottom could be in color to add some interest.
On the first page, the shoes are distracting...May be her legs should be on the floor?
On the second page, the woman seems warped. Her shoulders are out of proportion with the rest of her body. Can probably be fixed in photoshop. The heading color adds some color, which is good.
The last page is a bit cluttered, may be remove the pictures at the bottom and just have the About Us, etc. text. This would leave more room to concentrate on the top graphic.
It may be what you're trying for, but this reminds me of another company that offers web services at low rates and has women on their pages.
Pretty well everything else has been said. The images on the home page could be in color, or perhaps go to a color image on rollover.
The footer could be a little larger as well, but it isn't bad as is in my opinion. My eye doesn't have a clear landing point either except for maybe the lady's face.
It has very nice typography and a good vibe, I like the colors.
I don't like the girl, the pictures with the girl, for me that is not attractive and especially not for web agency. The hole concept is like a consultancy company or something similar ...
the header is to simple and I don't think you need the separators for the menu items.
Nowadays a web design company has social activity, there is no social icons on this concept (of course this is not a must, I'm just saying).
Here is a list of cool designs from web agency's:
http://www.contrast.ie/
http://www.zaum.co.uk/
http://www.raincreativelab.com/raincreativelab/home
http://paramoreredd.com/
http://onwired.com/
http://artgen.us/
http://particletree.com/
http://www.thinkingnext.com/
Now I have seen your first design and I have to say that the image used there looks much better.
AND I HAVE TO SAY AGAIN "I LOVE YOUR TYPOGRAPHY"
Cheers
Nice review, Beat me to it, I was gonna be the first reviewer after i got some sleep :O