You can book a taxi via following methods:
Online: http://www.drivingforcecars.co.uk/
Telephone: +44 208 294 2060
Yes, it's possible to pre-book a taxi with Driving Force Car Service, please contact the company.
Driving Force Car Service has both regular and air-conditioned taxis, please mention your preference at the time of booking.
Please contact the company on their helpline number to make any changes.
Generally drivers will meet the passengers at the arrivals on airport pick ups but do check with the company.