A mother whose son was killed by a two-ton branch which toppled onto him while on a school visit to a National Trust stately home in north Norfolk has launched a �300,000 compensation bid in London's High Court.

Daniel Mullinger, 11, was among a group of ten children undertaking a 'Monster Trail' search for clues scattered around the grounds of Felbrigg Hall, near Cromer, when he was killed instantly by the falling 70-foot branch.

Three of his fellow pupils from Heathlands CofE Primary School were severely injured in the June 2007 tragedy, the court heard, and their parents are also suing the National Trust over the accident.

Daniel's parents were too distressed to attend the hearing today June 21as the claimants' QC, Jonathan Watt-Pringle, outlined the case against the National Trust, which is denying liability.

Daniel's mother, Wendy Mullinger, of Pirie Road, West Bergholt, near Colchester, is suing the National Trust for bereavement over the loss of her son.

The High Court hearing continues.