I have to agree on most points
info202 made, except for the statement on opening external links in a new window. My reasoning for this is one of usability/accessability see the post
here for more information.
Being polite you are spamming the search engines with your alt tags, and you really need to stop and consider disabled people.
Anyone using a screen reader such as JAWS is going to have to sit there while it reads out countless instances of "web site design Ireland,ireland affordable web site design,web site design northern Ireland,Design Company,Graphic Design" before it ever gets to your content. Repeat that text to yourself 10 times out loud and you will understand how infuriating it is.
As a "professional" web design company I would expect you to know the basics of making an accessible site, especially in the light of cases such as those mentioned
here, you owe it to your clients.
Your page does not validate according to
http://validator.w3.org as part of the accessibility guidelines you should be creating documents that validate to published formal grammars
Checkpoint 3.2
You say "award-winning" but don’t say what award(s) therefore you should add a page of information detailing this.
A price guide is always a nice idea and you should consider adding a portfolio.
Am I being harsh? Yes, but there’s nothing there that can’t be fixed.
Good luck.