I see, TIL! Seems onerous!
So if the OP was not doing an annual tax return (they were PAYE for example), would they still have to make a declaration?
Is it common to do this declaration or is it something new(ish) that people may not be aware of yet? In 10 years of returns my accountant has always asked about gains/losses on shares but has never asked submitted a list of what was acquired in that year, despite having all my transactions. Should I go directly to jail and not pass go?