The UK RAID said in a press release:

The Rail Accident Investigation Branch (RAIB) released its report into an incident last year, in which a rail collision was narrowly avoided after a passenger train failed to stop at a signal near Didcot in Oxfordshire. The RAIB has made nine recommendations.

For the complete report, see:

http://www.raib.gov.uk/cms_resources/081120_R232008_Didcot.pdf