In plain English chattels are goods that physically exist, can be touched. It is possible to own assets that don't physically exist such as shares in a company or a racehorse; digital music and ebooks.
The difference between the old and new laws is that the old law listed the chattels the law applied to:
“Personal chattels” mean carriages, horses, stable furniture and effects (not used for business purposes), motor cars and accessories (not used for business purposes), garden effects, domestic animals, plate, plated articles, linen, china, glass, books, pictures, prints, furniture, jewellery, articles of household or personal use or ornament, musical and scientific instruments and apparatus, wines, liquors and consumable stores, but do not include any chattels used at the death of the intestate for business purposes nor money or securities for money
The new law has simplified this:
Personal chattels” means tangible movable property, other than any such property which—
consists of money or securities for money, or
was used at the death of the intestate solely or mainly for business purposes, or
was held at the death of the intestate solely as an investment:”.
It is clear the old law no longer applies to the chattels that are commonly owned today - electronic gadgets such as computers and televisions for example and to make a list of every conceivable chattel is unrealistic.
So, for the purpose of the law today chattels are everything that is owned by the deceased personally (not for his or her business) except money and investments.