You can book a taxi via following methods:
Online: http://www.marksspecialisedtransport.com/
Telephone: +44 152 279 3816
Email: info@markspassengerservices.co.uk
Yes, it's possible to pre-book a taxi with Marks Passenger Services, please contact the company.
Marks Passenger 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.