Interesting, but not precisely what it says on the tin.  The title and summary on the back would give the impression that the book is a collection of crazy laws enacted throughout the ages that are still in effect.  There are a few of these sprinkled throughout, but most of the entries are really more a historic overview of London laws through history; laws that seem insane to us now, but made sense to citizens at the time (for good or bad).

As I said, it's still a very engaging and interesting read; I learned heaps about London (did not know, for example that there's a city of London and a City of London (the latter being the 1 square mile section within the old Roman walls).  But I admit when I saw "Ludicrous" in the title, I was expecting something far sillier, the UK version of silly laws I've heard about in America like:

In Gainsville Georgia, you are not allowed to eat fried chicken any other way than using your hands.

In Arizona, having more than two vibrators in your home is illegal. If you own more than two in your house, you can be subject to criminal possession.

In Iowa, it is illegal for a man with a mustache to kiss a woman in public.

In Florida it is illegal for a divorced or a widowed woman to skydive on a Sunday afternoon.  Also, if an elephant is left tied to a parking meter, the parking fee has to be paid just as it would for a vehicle.  

The closest this book comes to this version of ludicrous is a law that states you cannot have a pack of playing cards within one mile of any building storing explosives or ammunition.  Which, I admit, is a stumper.

All in all, a good read; very informative, well-written and entertaining.  Just not silly.