Thanks all. This is what worked for me.
Go onto the album in iTunes. Right click, select Album Info, tick the box next (on the left of) to the empty album artwork box.
Go to Google, get the album image. Right click then save as [into where you want – we used Pictures], name it so you can find it, go to where you saved it, right click, cut, go to iTunes to the dialogue box that you left open (you did leave it open didn’t you?) right click over the box, control V to paste image.
Close the dialogue box. iTunes will run through all the songs on the album and paste the artwork in.
Job done.
Btw, using Windows/Vista.
Thanks to Hendy.