I'm not 100% sure because I don't collect these dolls myself, but searching for Pams I've come across a lot and learned a lot, and I'd say this isn't Sindy or Fleur, but Daisy by Mary Quant!
I mean I'm not sure about the Daisy part, but I AM 100% sure she's not Sindy or Fleur, sorry Jemboy!
You didn't say you had more info than just that picture :P. The auction says she's a Model Toys from Hong Kong doll, so she must be an authentic Daisy!
Daisy can be worth a LOT...and some of the outfits are really expensive - much more than many of Barbie's. Some boxed Daisys can go for well over £1000. Brunette Daisy is quite rare.
This doll is definitely a Daisy, I have them from time to time and have had a few outfits - I don't know a great deal about them. They are pretty dolls, but too small for my taste, and once the hair is 'undone' it's almost impossible to restore.