Visa services will be limited during July and August for all nonimmigrant visa categories. Therefore, the Embassy is encouraging applicants to apply for visas during the spring and early summer as appointment availability cannot be guaranteed. To facilitate this, they have opened up the appointment calendar through until the end of June. Appointments are scheduled through the Operator Assisted Information Service.
Travelers planning on entering the United States visa free under the Visa Waiver Program by air or sea carrier who do not have travel authorization approval under the Electronic System for Travel Authorization (ESTA), are encouraged to register now for summer travel, for if the registration denied, visas will be required.
The Visa Reissuance Program has been expanded to include H-1 visa applicants and their derivatives who are renewing a visa of the same classification that has expired in the last twelve months. Other qualifying criteria apply and can be found on our website at http://london.usembassy.gov/visa-reissuance.html. The Program continues to be available to O, P, J and C-1/D visa applicants. Please note that applicants must be physically present in the United Kingdom to utilize the Visa Reissuance Program and a consular officer reserves the right to request that an applicant appear in person for an interview after reviewing his or her application.