As of Wednesday, the charity had raised more than £270,000, and the funds will be sent to the charity's local partners in India to procure oxygen equipment for the seriously ill in both cities and harder to reach rural areas.
"We've surpassed anything we thought we're going raise before," said Hitan Mehta, executive director of the trust. "We've had lots of inquiries from people about what they're able to do, and what we are suggesting is donating their funds so we can make a difference on the ground immediately."
Britain is home to a large Indian diaspora community of about 1.4 million people, and many have sought ways to support their home country during this crisis.
A separate online fundraiser on the GoFundMe website has collected more than £380,000 within days, and its organisers say the funds have enabled them to order hundreds of oxygen concentrators and ship them to India by the weekend.
A first British government shipment of 200 pieces of medical equipment, including ventilators and oxygen concentrators, arrived in Delhi Tuesday, and the rest is due to arrive by Friday. The equipment was sent in response to a request from India and will be transferred to Indian hospitals.
The Foreign Office said late Wednesday that the UK will also send three oxygen generation units to support India's fight against the pandemic. The units, the size of shipping containers, can each produce 500 litres of oxygen per minute, enough for 50 people to use at a time, officials said.
