As expected, a section of high street store Selfridges was revamped with a special Are You Being Served? theme for the event. Richard played Miss Brahms on the BBC sitcom between 1972 and 1985.
The star's former EastEnders colleagues Natalie Cassidy (Sonia Fowler), June Brown (Dot Branning), Laila Morse (Mo Harris) and Ricky Groves (Garry Hobbs) were among those helping to serve customers today. Are You Being Served? actor Nicholas Smith, best known for playing Mr Rumbold in the show, also took part.
Cassidy, who dressed as Miss Brahms for the occasion, told BBC News: "To have this sale of Wendy's stuff here at her favourite store for charity is a big old thing to have achieved. She was a very stylish lady - the clothes are very, very reasonable - it's a steal."
Proceeds from the sale are to be donated to The Lady Taverners charity, which helps children with special needs to take part in sports.
Richard passed away in February 2009 following a battle with cancer. She was 65.