You can book a taxi via following methods:
Online: http://www.gototheairport.com/
Telephone: +44 120 679 0855
Email: flightsairporttravel@yahoo.co.uk
Yes, it's possible to pre-book a taxi with Flight Airport Travel, please contact the company.
Flight Airport Travel 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.