It does as well as possible with tips on staying cheap in London. This is a daunting task to say the least. We have travelled extensively in Europe and the UK is by far the most expensive.
As for the book itself, it does not miss the highlights and is as good as we have found for tips for the price conscious. No significant errors were found as of our last trip (August 2001). The maps are weak but adequate enough to get you there. The info on the tube system is good, but off by about 10 pence.
The annual event info is good as are the sight listings.
All in all an adequate book, not significantly better than others we have read, but by no means any worse.