Hi Hettie,
All the Post Office Savings products you mention are included on our systems and can be found if you use the "Savings Search" option - click here.
We don't include these Post Office Savings products in our Savings Best Buys because they do not currently meet our Savings Best Buy criteria. The Post Office Cash ISA and Instant Saver Accounts both include a 1.50% bonus for 12-months, which is above our threshold of a 1% bonus for inclusion in our Savings Best Buy charts.
The highest rate on the Post Office Growth Bonds at the moment is 6.75% on the 1 year Fixed Rate bond which just falls just outside the bext six short term fixed rate bonds.