The following reports and documents are available for download:

Papers:

Donlon, C., I. S. Robinson, W. Wimmer, G. Fisher, M. Reynolds, R. Edwards, T. J. Nightingale, 2008: An Infrared Sea Surface Temperature Autonomous Radiometer (ISAR) for Deployment aboard Volunteer Observing Ships (VOS). J. Atmos. Oceanic Technol., 25, 93–113. 

Werenfrid Wimmer, Ian S. Robinson, Craig J. Donlon, Long-term validation of AATSR SST data products using shipborne radiometry in the Bay of Biscay and English Channel, Remote Sensing of Environment, 2011

Reports:

Phase one final report:
ISAR-DEFRA-FREP01-1B-main.pdf
ISAR-DEFRA-FREP01-1B-Appendix.pdf

Phase two final report:
ISAR-DEFRA-FREP02-1.pdf

Phase three final report:

CEOS:
CEOS comparison of IR brightness temperature measurements in support of satellite validation. Part I: Laboratory and Ocean surface temperature comparison of radiation thermometers. 

CEOS comparison of IR brightness temperature measurements in support of satellite validation. Part II: Laboratory comparison of the brightness temperature of blackbodies. 

Manuals:

ISAR 5C manual:
ISAR-User-Manual-v111.pdf

ISAR 5D manual:
ISAR-User-Manual-v2.01.pdf
Procedures_manual_v1.01.pdf