Like the man said, £2k wouldn't even cover the dig, let alone, the hydraulics system to lower/raise the car into the ground.
Also, just to clarify, couple = 2. Always.
And couple of grand =£2k. Always.
To actually have an underground/basement type parking garage built will cost tens of thousands. In effect, you are adding an (basement-type) extension to your house.
iam not talkign about a house , talking about a block of flats.
. I've done some work to the living room and toilet but they're not even finished!