Try Southwark Council, they used to have a depot for unwanted items that they would then pass on to first time tenants who could not afford to furnish their new homes, if they can't help try the Trinity Hospice you can find them on the internet I'm sure they would be glad of some help.
you could always leave it just outside your front door.
I was surprised to find that within half an hour! of putting out my futon mattress for the council to collect, it had been swiped. But I was very pleased really, as I got it 7th hand anyway, had used it myself for four years, and glad that it has been recyled. Someone needed it. Maybe your odd and ends would go the same way.
Charity begins at home?
I posted it in another thread on this site (not sure how to link them) but I've used a charity called Emmaus to take furniture www.emmaus.org.uk. They work with homeless people to try and get them back into work. They'll take furniture, electrical goods etc. I thought they were great.