With HREFLANG tags, you are sending weird signals. I would recommend ensuring that /ie/ is claimed in Google WMT and targeted to Ireland. The content in the subfolder needs to be specific to your Ireland market, meaning it needs to have different content. It doesn't have to be completely different, but different. Otherwise, it looks like duplicate content and the SEs are going to pick the stronger of the two.
Right now, you are telling them that the only difference in the content is that /ie/ is in Irish English, and /gb/ is in British English. It's not different enough to warrant showing the other content over your main homepage as that is stronger.
Does that all make sense? I would remove the HRELFANGs, ensure the right targeting is in place and that the content is different per country to target those countries.