Thank you. I've changed it to the below but it charges me £7.99 for a 30kg. That £7399 is meant to be the charges for up to 25kg
AND
"based on subtotal for any column"
If the subtotal for column "TotalWeight" is ">" "25"
AND
"based on subtotal for any column"
If the subtotal for column "TotalWeight" is "<=" "50"
Flat rate change of 15.99