Leaving the United Kingdom to a non-EU country:
Cash of a value of €10,000 or more or its equivalent in other currencies [£7,273; Rs.7,09,831] must be declared and a declaration form must be filled.
http://ec.europa.eu/taxation_customs/customs/customs_controls/cash_controls/index_en.htm
India - Currency Import regulations:
Foreign currencies: unlimited, however, amounts exceeding USD 5,000.- (or equivalent) in cash [£3,284], or USD 10,000.- (or equivalent) in traveller's cheques must be declared;
Local currency (Indian Rupee-INR): Import of INR is prohibited, except for residents of India importing up to INR 7,500/-
http://www.iatatravelcentre.com/IN-India-customs-currency-airport-tax-regulations-details.htm