From BBC:

The George Cross is one of the highest decorations that can be awarded for acts of gallantry.

L/Cpl Croucher said: “All I could do in the moment was shout out ‘grenade’ before diving on top of it.”

His bag was crammed with equipment which cushioned the explosion. His three comrades suffered just cuts and bruises while L/Cpl Croucher was thrown in the air.