**Notes/thanks/other declarations**

The authors wish to thank the following:

• The members of the Lunan Catchment Management Group, especially Janice Corrigan (Angus Council, chair), Peter McPhail, Gavin Clark and Deborah Spray (Nature Scotland); Alban Houghton (Balgavies Loch Reserve); Rab Potter (Scottish Wildlife Trust); Scott Leith (SEPA); Marshall Halliday and Craig Macintyre (Esk Rivers and Fisheries Trust);

