On the face of it a layer of orange jelly may not sound the best way to protect a soldier's head from high velocity bullets and shrapnel.But the British Army's standard-issue combat helmet is set to be upgraded with a liner made from gooey miracle gel, which responds to a sudden impact by locking instantly into a solid form - absorbing huge amounts of energy harmlessly.A UK-based technology company was today celebrating a £100,000 contract from the Ministry of Defence to develop its D3O shock-absorbing gel to help save the lives of British troops fighting on the frontline in Afghanistan.