N14,
It was good on some levels, but it portrayed 'too much, too soon' in the way of changes for good AH IMHO.
His POD begins with the Chartists and the 'Rad' Lords, IIRC, who, after blowing up Wellington, help Babbage (and others) with government funds and kick off a steam powered information age of sorts. I got the distinct feeling that many of the changes; especially social bits, happened far, far too quickly. A quarter of a century is just too little time for such sweeping changes, computers or not.
I remember the protagonist's brother, for example. He's back from the war in the Crimea and is described as a strapping six feet plus thanks to a better knowledge of nutrition. Knowing that children need good food and drink and actually ensuring that they recieve it are two very different things. The protagonist's family are not rich or even part of the rural gentry. For his brother to recieve the benefit of that nutritional knowledge, the necessary foodstuffs need to be both cheap and readily available. Nothing in the book even suggests that the Rad Lib government subsidizes food distribution in such a manner.
There were other social bits I found equally implausible. People just don't change that fast.
That being said, I liked some of the ideas presented. An US civil war engineered, managed, and eventually settled by an interventionist Britain is very intriguing. The scene in which the streamlined steam car beats the older models in nifty, as is the idea of the mechanical 'flash card' movie screens conrolled by punchcard-driven Babbage engines. The Buckingham Palace Guard wearing cameoflauged uniforms, carrying 'snaildrum' fed magazine rifles, and marching about to music played by a steam powered, Babbage engine controlled, calliope was nicely jarring too.
Bill