You might enjoy a book called Financial Shenanigans (https://www.amazon.com/Financial-Shenanigans-Fourth-Accounti...). It's essentially examples of detective stories based on financial statements.
from this year i think, there is something called "expenditure tax" so in case of a p&l statement, if you increase your expenses to reduce NPBT, you pay MORE expenditure tax and vice versa so even this loophole is now effectively closed.