On 20 Feb, 12:20, Adrian wrote:

So how come the house across the road from me was refused planning
permission for a second vehicular access to the road? How come there's a
development going on at the moment just down from me which has had
vehicular access restrictions placed upon the site?

Quite possibly because some local authorities have planning guidance
which restricts the number of parking places per dwelling. "In and
out" driveways tend to potentially provide more parking spaces than a
single driveway.

Ealing is an example: "The maximum parking provision for each
residential unit indicated in the Appendix will be applied on the
basis that it does not result in sites being developed with an average
of more than 1.5 off-street car parking spaces per dwelling. This is
in order to reflect the guidance in PPG3 paragraph 62":

http://tinyurl.com/37tcbt