You can book a taxi via following methods:
Online: http://www.wilcocabs.com/
Telephone: +44 167 467 2557, +44 167 467 3830
Yes, it's possible to pre-book a taxi with Wilco Cabs Ltd, please contact the company.
Wilco Cabs 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.