‘Public research-led cluster’ might be more to the point, as it appears difficult to judge if these are more or less ‘intellectual’ than other forms of clusters.
I wish to congratulate the authors for their careful and thoughtful revision. All remarks have been considered, most have been fully incorporated and the paper has gained substantially from revision. As a consequence, I can now recommend the paper for publication with minor corrections, including some language editing. Since this may be managed by the editorial office, I do not see the need for another review.