The book has been out of circulation for quite a while so a reprint is worthy.
Unless you plan on doing a major update (version 2) which I am not sure is yet warranted by additional new problems etc, I'd think the inclusion of an additional few pages, possibly loose, detailing corrections would be sufficient and get it back on the shelves.
I think that in a few years time, a bouldering in Ireland (version 2) will be called for..