Sinn Fein president Gerry Adams is due to travel to London today for talks with Prime Minister Tony Blair.
The meeting is expected to focus on upcoming moves to restore devolution in the North following Sinn Fein's decision to endorse the PSNI.
Mr Blair says he has received commitments from the DUP that it will agree to share power with republicans as a result of the decision.
Also on the agenda at today's meeting will be the issue of collusion between the British security services and loyalist paramilitaries, which was highlighted in a recent Police Ombudsman's report.
Mr Adams says he wants to know what happened to 25 files sent to the DPP after a previous inquiry by John Stevens into alleged collusion in the murder of Belfast solicitor Pat Finucane.
The DPP has still not made any decision on whether to bring charges in that case.