If what you’re looking for is high end designer clothes and accessories at lower prices than through normal channels, I would recommend the Pandora Dress Agency which is located at 16-22, Cheval Place, conveniently near Harrods.
While they’re not giving anything away here, I’ve gotten great deals over the years on many really nice items by European designers that would be otherwise unaffordable. Many of the items have never been worn and are in new condition. All the big Italian and French names are here. There were some visits when everything I bought in London came from this shop. That’s how good it usually is.
You are free to go in and browse, touch and try on without anyone making you feel pressured, although there are people to help you if that’s what you prefer.
They have really great selections of leathers, cashmeres and handbags as well as every other category of clothing and shoes.
“Dress Agency” is simply what the British call a consignment shop. While there are a number of other dress agencies on this same street, Pandora is my favorite.