Update: I have modified the map to colour-code the wells by the date they were drillied. Pre-1949 are cyan, 1950 - 1979 are yellow, 1980 - 1999 are (light) pink, and 2000 - 2013 are (dark) purple.
Update 2: You can download the original data from the DECC website at:
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/224856/Landwells22July2013.xlsx. Lat/long data is in Deg/Min/Sec.
I created .kml files to plot the data in Google earth. You can download the 4 files at: