ENTRY/EXIT REQUIREMENTS: All U.S. citizens need a valid passport and valid Indian visa to enter and exit India for any purpose. Visitors, including those on official U.S. government business, must apply for visas at an Indian Embassy or Consulate abroad prior to entering the country, as there are no provisions for visas upon arrival for U.S. citizens. If you don’t have a valid passport and visa you could be immediately deported. The U.S. Embassy and Consulates in India cannot assist you if you arrive without proper documentation. You should carry photocopies of the bio-data page of your U.S. passport and the pages containing the Indian visa and Indian immigration stamps. These come in handy if you lose your passport or if it is stolen. Having them will also help in obtaining an exit visa from the Indian government. Replacing a lost visa, which is required in order to exit the country, can take three to four business days.
For UK, I need to make sure.
But common UK Nationals do require Visa to enter Bharat.
Not sure about Head of State (Queen).
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भवदीय ,
पंकज अग्रवाल
विशिष्ट सदस्य, भारत स्वाभिमान
भारत स्वाभिमान व्यवस्था परिवर्तन पत्रक पढने के लिए :
http://www.bharatswabhimantrust.org/bharatswa/vyavstha%20parivartan.pdf