You can book a taxi via following methods:
Online: http://www.parkersdrive.co.uk/
Telephone: +44 173 722 4545
Email: info@parkersdrive.co.uk
Yes, it's possible to pre-book a taxi with Parkers Executive Car Service, please contact the company.
Parkers Executive Car Service 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.