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Allan GRIMSON
Both men had been tortured and bludgeoned to death in
Portsmouth, Hampshire.
Royal Gibraltar Police have appealed for information
surrounding Mr Parkes' disappearance and said, depending on what comes
to light, they could consider travelling to the UK to question Grimson.
Mr Parkes was last seen leaving the Horseshoe bar in
Gibraltar to get something to eat, according to the police.
Someone fitting his description was then seen drunk
at a nearby naval function inside the Fleet Pavilion at the Hole in the
Wall pub.
He had left his passport, possessions and Christmas
presents for his family on the ship and had written to his parents
saying he would be home for Christmas.
Appeal
Superintendent James Mckay said police in Gibraltar
would join forces with Hampshire police, who carried out the original
investigation into Grimson.
He said: "We appeal to any of Simon Parkes'
colleagues who were with him on the night he disappeared and also any
person who was at the bars or Fleet Pavilion to contact the police.
"We request that any persons serving on board HMS
Illustrious in December 1986 contact us."
Mr Parkes parents, Dave and Margaret, backed the
appeal.
Mrs Parkes said: "It's been 15 long years for us. In
the first few years we hoped Simon might have contacted us by after a
while we lost that feeling.