Steve writes
I am travelling into London from the north and wish to park my car on
the outskirts use the tube and visit London for 2 days, I need to get
to Paddington station as its a street away from my Hotel, where is the
best place to leave my car?

Where in 'the north' are you travelling from? Which route are you
taking into London?

(Alternatively you might want to consider taking the train all the way
if you don't need your car whilst in London - e.g. Midland Mainline are
offering Manchester-London returns for a tenner right now, or first
class for just twenty quid return.)

--
Dave