For British-focused subjects look for any book by Simon Lavington; most likely you'll find it in a British bookstore ... for which you appear to be suitably located :->. Here in the USA they are hard to find. Three possibilities:
- Alan Turing and His Contemporaries: Building the World's First Computers
- Early British Computers: The Story of Vintage Computers and the People Who Built Them
- The Pegasus Story: A History of a Vintage British Computer
Some British-focused books from other authors:
- A Computer Called LEO: Lyons Teashops and the World's First Office Computer -- Ferry, Georgina
- LEO: The Incredible Story of the World's First Business Computer -- Caminer, David & Aris, John & Hermon, Peter & Land, Frank
- The MU5 Computer System -- Norris, D. & Ibbett, R.N.
- Calculating Instruments and Machines -- Hartree, Douglas R.
I personally enjoyed:
- Memoirs of a Computer Pioneer -- Wilkes, Maurice
(I also enjoyed both LEO books!)
Paul Cerruzi is a well-known historian of the era, but not British-focused. Two examples:
- Reckoners: The Prehistory of the Digital Computer, from Relays to the Stored Program Concept, 1935-1945
- A History of Modern Computing
For those interested in learning more about the early days of mainframes, I highly recommend checking out books that dive into the history of computing, like
The Computer: A History of the Information Machine by Martin Campbell-Kelly. It covers the evolution from early machines to the rise of mainframes. If you're also looking for resources to stay on top of assignments while exploring these fascinating topics, you might find it helpful to check out
domyhomeworkfor.me It could give you a bit of extra time to immerse yourself in some of these books without falling behind on other commitments.
There are all generally "low technical" but much, much better than a quick gloss. What it sounds like you are looking for?