I was in the area the afternoon so popped around.
What a fantastic place!
The centrepiece of the venue is a massive map of Central London with 3-D models of the buildings. There is a small photograph of it here. One could spend hours looking at it.
I spent some time in the book shop and stumbled upon the reference section. They have a collection of periodicals from organisations such as the Institution of Civil Engineers.
One of the magazines I flipped through was a special edition about the building of the high-speed link between St. Pancras and the Channel Tunnel. More technical detail than you could ever wish for (if that sort of thing rocks your boat...). They're not available to purchase, sadly.
Naturally, the first thing I did when I arrived home was try to find the issue on the web instead.
The individual articles are provided as separate PDFs but it's well worth browsing through.
If you've ever wanted to know about ventilation shafts, the building of the new Thameslink Station under St. Pancras or the cost of the project then look no further!