Jane Vass, from Age UK, welcomed the minister's announcement, which she said was "long overdue".

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Both Ms Adams and Mr Vass, of Harlington, died from multiple stab wounds.

BBC: Family pay tribute to murdered Heathrow hotel worker

Mr and Mrs Clough said challenging Vass's bail would have saved Jane's life.

BBC: John and Penelope Clough

Alice Adams and Tibor Vass, both 20, were discovered at premises behind the Radisson Edwardian Heathrow Hotel, west London, where they worked.

BBC: Family pay tribute to murdered Heathrow hotel worker

"To say we are excited and proud of Papa Mau reaching his final destination is an understatement, " said Bill Vass, CEO of Liquid Robotics.

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Police found the bodies of Ms Adams and Mr Vass, a Hungarian national, at the property in New Road, Harlington, after concerns were raised for their welfare.

BBC: Family pay tribute to murdered Heathrow hotel worker

"The SV3 is a tremendous step forward in terms of what we can accomplish in the ocean and gives customers a competitive advantage to capture data in the most challenging ocean conditions, " said Bill Vass, CEO, Liquid Robotics.

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After Vass was jailed for a minimum of 30 years in October 2010, her parents set up the Justice For Jane Campaign which prompted an amendment to the law earlier this year meaning prosecutors can now appeal against bail rulings.

BBC: John and Penelope Clough