EPB and Clock in radio display

Hi have just bought my dream motor of an RRS 4.2 Supercharged on a 55 plate with 41K on the clock and I'm knocked out by it. However couple of things are that when I turn off the engine and remove ignition key, the clock on the radio/cd screen stays green for about a minute
and the Electric Parking Brake Light on the dash (P) in red stays on for about 5 minutes - is this correct as I cannot remember it doing this before I bought the RR

Thanks for your help in advance - perhaps its the same on a Disco??

Cheers
Roger

sounds normal behavior to me

stuff stays lit up on mine to for up to 10mins.

the computer systems / BCM's over run for a few mins and take a while to shut down completely.