thing as over-optimizing a page and stuffing keywords every 5 or 6 words apart- this will do you more harm than good and may even get your site penalized.
"Professional and affordable web design company | YourCompanyName based in Glasgow" - nothing fancy just the right amount to help entice a user user to click-through to your page.
Notice the pipe bar in the middle of the description - this is a short-cut mode to relay different types of info quickly and effectively in a short sentence.