It is understood the Government is in talks with various churches, faiths and other organisations to see if the vigil could be replicated around the country.
Organisers hope churches, town halls and other community buildings will mirror proceedings at the Abbey and that thousands of candles will be blown out simultaneously across the country at 11pm.
They also want the day to be inclusive, with all generations and communities getting involved.
It is believed that a wide range of groups will be invited to the Westminster vigil including the Brownies, Scouts, Guides and representatives from all services of the British military.
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A damp and cold night ahead. Valentine's Day will start cloudy but become brighter in the afternoon. Risk of showers along the Kent coast.
Cold and damp tonight with outbreaks of rain. A cold and dull start to Valentine's Day but becoming drier and brighter by the afternoon.
Rain turning more patchy this afternoon but more persistent along the coast. Feeling cold in the brisk north-easterly wind.