You can book a taxi via following methods:
Online: http://www.ecabbi.com/
Telephone: +44 189 583 3833, +44 192 383 3833
Telephone: +44 785 218 0695
Email: service@ecabbi.com
Yes, it's possible to pre-book a taxi with Ecabbi Ltd, please contact the company.
Ecabbi Ltd 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.