Countif & sumif combined required to solve answer - please help

Hi Guys,

Need help please!

See attached file, "Test" and the below example;

I need a formula that will do the following;

Count the number of Basic Charges (in column E = yellow) that are sent on the same date (in column F = purple) to the same post code (in column T = blue) and provide an adjustment (in column AB = orange) for the sum of the Basic Charges that match this criteria less the lowest Basic Charge within the same criteria.

For example;

Let's assume the below are sent to the same post code on the same date;

Basic1 = $5
Basic2 = $10
Basic3 = $15

The adjustment would be the sum of Basic1, Basic2 & Basic3 = $30 - the lowest Basic Charge (Basic1) = $5
Adjustment = $30 - $5 = $25

$25 is the answer

This is known as a consolidation adjustment where the client is to pay for the lowest Basic Charge and be credited for all other Basic Charges sent to the same post code on the same date.

I have sorted the attached file in date and post code order. Can you please assume this sort is not done when you are providing your formula solution. It would be preferable to have the formula without sorting first. If you can only provide the formula by sorting the above first please advise that in your answer.

Please supply the formula below to be entered into column AB (orange) on the attached file, "Test".

Thanks in advance!