Hang on a minute, looks like another ticket scam. You can park in residents bays to unload/load.
This pasted from Westminster Council website :
Private vehicles
single and double yellow lines 8.30am to 11am: as long as necessary
single and double yellow lines 11am to 6.30pm: 20 minutes
single yellow lines 6.30pm to 8.30am: unlimited
double yellow lines 6.30pm to 08.30am: as long as necessary
Pay to Park and resident bays during controlled hours: 20 minutes
Pay to Park and resident bays outside of controlled hours (always check signs for controlled hours): unlimited
Private vehicle owners can only stop to load and unload where the items are too bulky or heavy to be carried from the nearest available parking space
Original Link is here:
A guide to loading and unloading rules for businesses.