Here are the addresses of the British High Commissions in India:

New Delhi:
British High Commission
Shantipath, Chanakyapuri,
New Delhi 110 021
Office hours: 0900-1700 hrs
Phone: +91 11 2688 6506
Fax: +91 11 2687 0065
Out-of-hours: +91 11 2687 2161
email: postmaster.nedel@fco.gov.uk

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Kolkata:
British Deputy High Commission
1A Ho Chi Minh Sarani,
Kolkata 700 071
Office hours: 0830-1600 hrs
Phone: +91 33 2288 5172/2288 5173-76
Fax: +91 33 2288 3435
Out-of-hours: +91 33 2288 6536
Duty Officer: 98310 75663
email: Kolkata@fco.gov.uk

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Mumbai:
British Deputy High Commission
Maker Chambers IV, Second Floor, 222 Jamnalal Bajaj Road
Nariman Point, Mumbai 400 021
Office hours: 0800-1600 hrs (Mon-Thur) | 0800-1300 hrs (Friday)
Phone: +91 22 6650 2222
Fax: +91 22 6650 2324
Emergency Duty Officer: 98200 00343
email: postmaster.bomba@fco.gov.uk

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Chennai:
British Deputy High Commission
20 Anderson Road,
Chennai- 600 006
Office hours: 0830-1630 hrs (Mon-Thur) | 0830-1330 hrs (Friday)
Phone: +91 44 4219 2151
Fax: +91 44 4219 2322
Duty Officer: 98400 82731
email: bdhcchen@airtelbroadband.in