You can book a taxi via following methods:
Online: http://aataxiservices.wix.com/a-a-taxi-services
Telephone: +44 797 974 8450
Yes, it's possible to pre-book a taxi with A & A Taxi Services, please contact the company.
A & A Taxi Services 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.