I'd also be very careful about the house clearers.
Your local auction house is a much better bet and you may be surprised at what they can sell for you (People seem to want the strangest, tattiest things). If you can be bothered/are able to take the stuff to them rather than have them collect it from the house, you *might* end up with a profit.
As well as the charity shops, there may be recycling centres in your area. They may take things that charity shops won't like small electrical appliances.
It is a really hard horrible job breaking up a house, that's why you really need someone else to help out if you can possibly get them.
All the best, petal :-))