Cambridgeshire FHS sell a CD-ROM of Orwell PR transcriptions 1560-1950, price £14.00
http://www.cfhs.org.uk/cgi-bin/bookstall.cgi?CD-Rom
(I can't see a search facility on the page to get to the CD you want to find, but the CD-ROMs are listed in alphabetical order, so you could just scroll down to the O section - quite near the bottom of the page.)