The servicemen will be flown into RAF Brize Norton in Oxfordshire. Private ceremonies for their families will be held on the air base before the cortege leaves via the Britannia Gate on its way to the John Radcliffe Hospital in Oxford.
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Sussex astronaut Tim Peake's space mission will be celebrated with a free exhibition at The Novium Museum in his home city of Chichester.
Emergency rescue teams are currently at the scene in East Sussex searching for another missing person.
Plenty of warm sunshine with the chance of thundery showers later.