I have done a lot of H&S work and the site looks exactly as I would expect it to, not under construction at all. Visually it is sending the message I would expect when looking for caution signs.
Unless the logo is old and established I would consider changing the triangular sign for a red and white hazard warning sign, just to break up the yellow a little.
You have all the signs I would have wanted to buy when I was in industry and they are well laid out.
I can clearly see the deliver information on the right, which is good.
I can't find your company address, the phone numbers are 0845 and the about us page is blank, so a bit of a trust issue there.
Not sure if you are working on the site right now but while I was browsing the links sidebar on the left disappeared and became small black text links
When I first looked 5 minutes ago you had black and yellow hazard tape top and bottom of a yellow banner but now it's gone .......