The family of missing Katrice Lee are marching to Downing Street in London to mark the anniversary of her disappearance in 1981.
Katrice was two years old when she went missing from a NAAFI supermarket in Germany where her father, Richard Lee, was stationed at the time.
The toddler disappeared on her birthday over thirty years ago and has not been seen since.
The case of missing Katrice was brought the parliament earlier this month when MPs debated how the case had been handled.
The government had previously promised to do all it could to get the family from Teesside more information about their daughter's disappearance.
More top news
The owners of a care home near York, where an elderly woman died of hypothermia, have been ordered to pay more than £1.6 million.
An investigation has found the missile that downed flight MH17 killing 298 people was brought in from Russian territory.
Sam Allardyce's shock departure as England manager has left the FA looking to find another manager in the space of two months.