Can anybody please give information on cheap flights from bangalore to London. the return airfare < 30K?

I am travelling from bangalore to UK in july 2007. need advice on booking cheap tickets. i tried online with yatra and make my trip, also checked directly with jetairways , lufthansa, airfrance, emirates, indian airlines. the cheapest return fare is 39 K...i am looking for an option of <30 K. i donot mind taking multiple stops. freinds pls advice me.