Pre 1947 Shillings..good Deal?

I'd say they're good prices, say they are .500 silver versions that equals 2.827*grams of silver content.

70*2.827=197.89g
45*2.827=127.215g
13*2.827=36.751g

With silver being about 0.42p per gram, you'd be under or about paying spot bullion value. So with the gram totals, if you're spending about 2/5's of the weight in money that's good 197.89/5=40(approx) 40*2=80. Obviously the more you get, the better the value economies of a scale. In my opinion I'd buy them, and these prices are just on silver content. At 50%, there may be higher content coins aswell. Then if some of them are in good condition you have added numismatic value, if they aren't in good condition you have bullion.

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Made a few amendments of the weights, more precise.

Yeah those prices are good :), they are about spot value. I know you don't want to melt them, it's just if they don't turn out to be very good-you can use them as silver bullion and amass a nice amount.
Silver content in a shilling is as followed: pre 1920 0.1682 troy ounces about 5.2 grams of silver content
1920-1946 0.909 troy ounces about 2.8 grams of silver content
Shilling weight about 5.7g and way earlier ones about 6g, your prices are good/right. It's really good to be able to get them at spot value in my opinion, but if you buy more bulk let economies of a scale take place.

Another quick thing if you are pricing by silver spot, keep an eye on the market-always changing ;). I wish I could find spot silver coinage.

I think what he's saying is that it's better to sell to a coin dealer than on ebay, because ebay is full of unscrupulous people who will try to cheat you out of your money after you've sent them your coins. Which is true to some extent.