Exploring the role of hydrological pathways in modulating North Atlantic Oscillation (NAO) teleconnection periodicities from UK rainfall to streamflow

In this paper the authors draw upon an extensive UK hydro-climatological data-set, comprising >700 gaged records of streamflow and estimated precipitation to examine 7-year periodicities related to the NAO.The range in catchment responses (and potential additional cycles at 2 and 5 years) are interesting and I think the paper is appropriate for this journal (with suggested revisions noted below), although I'm not personally convinced that this paper provides 'critical process understanding' as suggested in the abstract, and its not clear how this work can translate to improvement of the practice and policy of water resources management (as suggested in the abstract).* Lines 179-183 should be reworked (e.g.GRT is lowest in southern and eastern England, but highest in south-east England?).* Figures 2 & 5: are rather small, and it would be useful to reproduce these at a larger scale.* Is it possible to combine Figures 3 & 4 so the plots can be compared more easily?* The Discussion is rather long and would benefit from a more selective review of the results, with more attention to suggestions for future research.