Well I'm with StopStart on this. There is a UN peace-keeping mandate to uphold peace in Congo. If the existing UN force (made up mainly from poorly equipped and trained African Union troops) is inadequate for the job, then if we want to maintain our permanent place on the UN Security Council, and our generally good worldwide reputation, then we should be at the forefront of reinforcements.
If Afrika be so important how come we haven't sorted out the small problem of Zimbabwewe yet?
Because there is no UN mandate to do so. Whilst I am sure Britain and probably France would support a UN mandate to intervene, China would almost certainly veto, and US would also probably veto. There is virtually no chance of getting a UN mandate to intervene.