HI, GO TO THE SITE, WWW.REPLACEMENT.COM AND CLICK ON CERAMICS THEN LOOK UP DALTON, IT SHOLD BE LISRED THRU THEM, GOOD LUCK! Ha.Went to all "Replacement" Sites, didn't have any vases just dishes/cups plates figurines.
Best thing to do, take them into a specilist shop. OR, if it has any marking on it (Stamps of some kind) Note them down, and you can get an estimate price from these. This link will give you some descriptions http://www.antique-marks.com/doulton-marks.html
The value is what ever the market allows the value to be when in a competitive environment. A vintage Royal Stetson Fedora could bring 100-150 dollars if in mint condition. Or, if no one is shopping for it, it might bring 50-60 dollars.
These were heavily mass-produced by the Royal Mint, so only a few pounds at most. Coins struck in silver have a scrap value - weigh them and calculate their value at £14 per 31.1035 grammes. Silver is at a 30 year high (October 2010)