The simple answer is "Don't use an estate agent"!
When my father died I sold his house myself. I paid for a few ads in the property section of the local paper, but without much success. What actually sold the house was simply designing some A4 posters, on ordinary white paper, giving the main details. ("For Sale - 3 bedrooms - Separate garage - No chain - OIRO £x - Phone 01234 456789"). I took those posters to a local copy shop, where I had them enlarged to A2 size, on brightly coloured paper, and then put them in the windows of the house. People viewing other houses in the area saw the posters and I soon had several interested parties, resulting in a quick sale.
I ensured that, when people enquired about the house, I had all of the details to hand (e.g. room sizes, council tax band, etc) on a printed sheet, so that potential buyers would get at least as much information directly from me as they would have done through an estate agent. If you try the same method you'll also need to provide a Home Information Pack (which wasn't a requirement when I sold my father's house):
http://www.direct.gov...mationpacks/index.htm
Chris