Fascinating and extensive archive at Durham University Library - http://reed.dur.ac.uk/xtf/view?docId=ead/mus/ehdlmmly.xml (http://reed.dur.ac.uk/xtf/view?docId=ead/mus/ehdlmmly.xml)
:)
Fascinating indeed. Would love to see some of those MSS - especially the Konzertstuck for piano & orchestra.