Displaying content at correct scale in UIWebView on iPad

Question

I have a UIWebView set to scale to fit in an iPad app that gets its content from and NSString.

If I turn off scale to fit the text is bigger, although would like it to be much bigger, but I lose the zooming feature.

If I set scale to fit on the text is very small as it is obviously scaling the lot to fit the page...and I get zooming back.

How do I get it to allow me to zoom but also decide how large or how small I want the font to be upon first displaying the content?

Thanks