Ok.. At least something exists for you I guess. I presume the "Meri Tuuli" had a copy on board? IMHO, GBP42.50 is a bit steep for a single stretch of coastline, especially if it is only valid for a year or so. Everyone has a copy? Wow!! Presuming that somebody cruising that part of the globe would also need something for Northern Europe, UK and the Med, plus charts, that's a significant amount of money to spend every year or so.
Around here there is so much to see that a cruiser remains probably around the stretch of a coast covered by a book for a year so. So in fact you need one book each year assuming you don't stay several years around the same cruising ground.
For instance , last year I cruised for 3 months, coming back from Trieste (North of Italy) I have done the coast of Slovenia, Croatia (where a year is not enough to explore their 2000 Islands), and Adriatic Italy. All this comes in one book alone.
This year I intend to cruise Greece and their hundreds of Islands and all that comes in another book, one that I am using on the last two months to prepare the voyage (475 pages). cruising is expensive as it is expensive to having a cruising boat. 50 euros a year for a pilot book is nothing and that's way everybody has them (figuratively speaking).
When I say everyone has them I am talking about practical experience and exchanging talks with crews of boats passing these waters. They are not actualized annually (the one that you buy now is the 6th edition) but even older have much of the information correct and in what regards Figueira da Foz conditions did not change on the last 15 years or so.
I have about 6 or 7 of those pilot books and more went on my previous boat when I sold it. The stretch of coast is not small (All Atlantic Portugal and Spain) and it is a big book with a very detailed information about everything you can imagine, including anchorages and nice places to stop, meteorology and so on. My wife would refuse to sail without one because I stay in anchor almost all the time and she wants assurances that it is a safe place (and some that look like are not)
They are not expensive for the information they provide and the money you can save with them. The price is the average price of a marina in Europe and those books have all information you need to find all the places where you can anchor safely. One night at anchor will pay the book.
Imray nautical charts and nautical books from Imray, Admiralty Charts and pilots for sailing navigation from Imray, Laurie, Norie & Wilson Ltd www.imray.com