I've used a black cab from Heathrow to central London a few times, but I still find using the Heathrow express more convenient and cheaper. Later getting a cab

I've used a black cab from Heathrow to central London a few times, but I still find using the Heathrow express more convenient and cheaper. Later getting a cab in Paddington to anywhere in central London is a breeze... compared to the M4/A4 constant traffic jams.