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"On 9 January 2014 Horsham Museum opened the exhibition "World War One 1914-19 Memories and Memorabilia ... It was soon apparent that it would be useful for the full text material to be made available in book form, with some editorial to make it readable." -- Page 3.
v. 1. Being a miscellany of memories and letters
v. 2. The Fortnightly Gazette 29 March to 19th July 1915.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Horsham on the front line 1914-1918 by Mitchell Julie. ISBN 9781902484549. Published by Horsham Museum Society in 2014. Publication and catalogue information, links to buy online and reader comments.