Tweet Next year crossing the Hillingdon borough boundary into Greater London could cost you £5.50 each time if the London Mayor, Sadiq Khan, gets his way. This Outer London Tax, will not only hurt local businesses but also hit family and friends visiting Hillingdon. We must stop this new Outer London Tax. Please sign the petition now. Attachments Attachment Size Petition 398.57 KB Outer London Tax Current Your details First name Last name Email Mobile number Postcode Address ID Address I agree to Hillingdon Conservatives using the contact information I provide to keep me updated via email and telephone on this and other issues until further notice. Leave this field blank