Search lowest value in array, return respective column heading

Hi

I've got an array:

A B C D
0.141823256 0.742925121 0.851363101 0.595020487
0.458170723 0.170578213 0.780241568 0.500781951
0.781171057 0.524171642 0.027494503 0.053290996
0.992753237 0.470996446 0.236928742 0.28520641

I'm looking for a formula to search the entire array (A:D) for the lowest value, and return the column name in which the value lies, e.g. the bold 0.027494503 in column C, if it is the lowest value in the array, the cell in another column (say E) needs to just say "C"

Please help! TIA

Hey guys thanks for the help, but it still does not work

I've attached the file, it has different people with custom format times: mm:ss.mss

I need the fastest persons name to be displayed in the green cell on the left with their respective time: e.g. Mr C = 03:54.657

Please assist

TIA!!!

Hey guys any luck?

Thanks daddylonglegs, works perfectly!!!!!