Spode England China Cowslip Pattern- Dining Set

I have a dining dish set with dinner, salad plates, cups and saucers, creamer dishes, etc with probably 50 + pieces that has been in my family for a long time. Mostly its in great condition but a couple pieces have small chips. It is manufactured by Spode of England, Cowslip Chealsea pattern. It looks sort of delicte and glazed. I was told it was valuable and would like to sell the whole set but have no idea what it is worth. Would love to get an estmate. The same pattern is here: 

http://www.ebay.com/itm/Vintage-Copeland-Spode-England-c1942-1975-Cowslip-Dinner-Plate-10-5-S-713-/310413804529?pt=LH_DefaultDomain_0&hash=item48461ac3f1

thanks for any input!

Good