Electrical stuff (if you dont think its suitable for the charity shops) should go to the Council's recycling plant in New Cross, but this of course requires you to have a car. Address details for this plant on the Council's website.

Regarding clothes, there are quite a few 'bins' around SE23 into which you can dump shoes and clothes, but please beware that the majority of these are not operated by charities, such as the Red Cross, but commercial companies. So although your clothes will be recycled (it will probably be sold on to countries in the third world or poorer parts of Eastern Europe), the profit the companies make from this will not go to charity. Organisations like the Red Cross, Oxfam etc will sell the best clothes in their shops in the UK, and much of the rest to the third world for donations or re-sale there, but at least their profits will go to charity.

There are loads of charity shops in Sydenham, SE26 I know, who will take clothes, shoes, books etc. Just in case you live on that side of Forest Hill.

I hope you get rid of your stuff without having to trawl around SE London too much.