Your main content needs more spacing to the borders (I always forget if it's spacing or padding but you get the point).
Your header is weird. The main part looks like it's a low-res image taken somewhere (despite it being only text) and the blue part is clearly out of place.
I suggest putting divisions between a page's sections. For example, on your index, separating the welcome text from the adverts section, from the RCN, etc. so it feels less like a huge neverending text.
And well you do need to check your syntax and typography, the text is interesting but it reads very fast and looks neglected.
Not much else to comment, hopefully make the icons smaller.