You can book a taxi via following methods:
Online: http://cablecars9229229.co.uk/
Telephone: +44 115 922 9229
Yes, it's possible to pre-book a taxi with Cable Cars, please contact the company.
Cable Cars 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.