UK and Ireland: Handwriting

Hector, L. C. The Handwriting of English Documents (2nd. rev. ed.), Hodder & Stoughton (1966) 136 pp. [This has photographs of the various hands from Domesday book to 1830 with the transcripts in the text.]
Newton, K.C. Medieval Local Records: A Reading Aid, The Hist. Assoc (1971) 28pp.
Wright, A, Court Hand Restored, or the Student's Assistant....., Clarke & Sons London, 1818. [Particularly useful if the text is in latin because it has appendices listing the latinised place names, surnames and Latin words, and plates showing the alphabets and abbreviations used.] [Reprinted by, e.g. Hardpress Publishing (2013)]