Horizon campaigners Lee Castleton, Seema Misra and Christopher Head will receive their OBEs this afternoon.

The former sub-postmasters were wrongly accused of taking money from the Post Office because of faulty IT software.

Ms Misra, who ran the West Byfleet Post Office, was sentenced to 15 months in prison in 2010 after being accused of stealing £74,000.

She was pregnant when jailed.

Princess Anne’s conducting the investiture ceremony at Windsor Castle.