So I’m slightly closer, I can get the right hand image to align with the banner above by right aligning the image only. Then making the central column image centre aligned and the left one left aligned. But then I have a problem with the text beneath being out of alignment unless I align each block of text left, centre and right which does not look good! I’m happy with the text being either left or centre aligned as long as it’s consistent.
I also seem to have a gap appear when I apply right align to the right image (none of the others though.
I finally figured this one out. Just in case anyone else has the same problem, I resized each image to 319 x 319px and made them fullsize – they were being scaled down to 300×300 and I think because they weren’t filling up their allocated space this caused problems with alignment.