This is a remarkably handy and useful book. London (and don't us Londoners know it) is at one and the same time seen as THE most expensive capital in Europe (places to stay, travel, eat) but at the same time scores highly on its freebies and cheapies - ranging from the extraordinary number of free galleries, museums, free concerts, lectures and events to its delectable and wide spread areas of green oasis in the city.
I've done a rapid run-through all the frees and cheaps this guide offers, and, despite having lived in London for a long long time, have discovered there's a whole load of free cheaps (!) I never knew about. For example - The Roxy in Southwark screens free 'old classic' movies, SOAS has free monthly world music concerts, there are various free talks running all the time, given by experts in their fields, on such topics as arts, sciences, ethics, economics etc etc at different venues. I was intrigued to find that 'The Dana Centre' - which I hadn't heard of, part of the Science museum, regularly runs not only free talks about scientific subjects - but also performances and artistic ventures which may link into a scientific topic under discussion. There are many gems for residents here within!
For tourists, this book also is extremely helpful. It's divided into sections , such as accommodation, eats, shopping (no, of course you have to pay! - cheaps not frees in these sections) there are a plethora of useful maps, and a good browse of all that's on offer before you arrive in this golden paved City (dream on, Whittington, Thrice Mayor of London) will leave you heavier in pocket and lighter in heart than the reverse which might have been your lot if you hadn't thumbed your Frommer's London so assiduously!