First Minister Peter Robinson said he was glad the deputy first minister had accepted the invitation.
We recognise that this will be a difficult ask for Her Majesty the Queen and a significant step for republicans.
The process has required us all to reach out and take decisions outside our comfort zone.
It is the right decision and a step forward for Northern Ireland.
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A colder start to the day with outbreaks of rain expected across Wales and southern England.
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
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