I've spotted a few things on google books if you haven't found them already -

http://books.google.co.uk/books?id=F4EKAQAAMAAJ&pg=PA

http://books.google.co.uk/books?id=pMUOAAAAQAAJ&pg=PA183

http://books.google.co.uk/books?id=Y8jYAAAAMAAJ&q=%22cock+low%22+leek&dq=%22cock+low%22+leek&hl=en&sa=X&ei=MVjTUPNexaTQBfDkgbgC&ved=0CE0Q6AEwBA

http://books.google.co.uk/books?id=LvALAQAAMAAJ&q=%22cocklom%22&dq=%22cocklom%22&hl=en&sa=X&ei=Y1nTUOu-OYSS0QW-84GwDQ&ved=0CDMQ6AEwAA (can't find this in full)