Simon Peter Maclellan, 27, from Gosport, Hants, has not been seen since Friday afternoon when he was released by magistrates.
Maclellan, who was on remand at HMP Winchester in connection with a serious assault, escaped when he pretended to be his twin brother, Mark, who is also on remand at the same prison for a less serious offence
Given that finger prints are unique, and photographs are taken and a unique prison number is given to each prisoner there really is no excuse for escape.
