One leading obstetrician at a Mumbai hospital says she delivers on average one baby to a British couple every 48 hours.
One London couple who have taken advantage of India's "baby factories" told the Standard of their joy at having twins.
Louis and Freya are the genetic offspring of Chris and Susan Morrison but were carried in the womb of a Gujarati woman who was paid £8,000.
The case will inevitably raise questions over the relative ease with which childless couples can go to India to have surrogate babies - and could also put pressure on British authorities to relax laws which outlaw commercial surrogacy. Today's case also raises the prospect of wealthy women, who do not wish to go through the inconvenience or pain of childbirth, travelling to India to have their eggs implanted in the wombs of Indian women.
Dr Anita Soni, a leading obstetrician and gynaecologist working at one of Mumbai's top hospitals, said: "I deliver babies from Indian women for British couples at the rate of more than 15 a month."
Dr Soni added: "For these surrogate mothers that amount of money is life-changing. It helps them set up a home, get their daughters married or something like that. There is absolutely no exploitation of these women. It is really big money. It is a jackpot.
"They go through a little bit of emotional trauma, but then they go back home and they realise they have done it for a good cause. I help more white couples than Indians, who are still sceptical about things. English couples come here much more in numbers."
Dr Soni spoke minutes before entering the delivery room at the Hiranandani Hospital where a 28-year-old Indian woman was giving birth to twins for another British couple.
The hospital delivers the surrogate babies of women sent there by three clinics in Mumbai - the Rotunda Clinic, Surrogacy India and Gynae World.
There are more clinics in Delhi and elsewhere in India including in Gujarat province where the Morrisons paid a total of £25,000, including hospital fees, for a surrogate to have their twins.
The Morrisons, from East Ham, had given up all hope of having children until turning to India. On 1 March surrogate mother Vimla gave birth to Freya and Louis after being implanted with Susan's eggs fertilised by Chris's sperm.
Susan, speaking from Mumbai where the family are waiting for UK immigration to give them the all-clear to return to London, told the Standard: "It's a miracle. We have got two beautiful babies - a boy and a girl. There were times when I thought this would never happen."
The Morrisons used the interview with the Standard to give hope to other childless couples. But they also took a sideswipe at Britain's "bureaucratic" surrogacy laws which outlaw commercial deals.
Susan, 37, a former teacher who now works for a children's charity, said: "Because of the complications surrounding surrogacy, Britain regards our children as Indian, while India happily accepts that they are as British as I am.
"It is a complete nightmare after nightmare. You go through so much trouble to have your children and then run into all the legal complications.
"We have not done anything wrong. The woman in Gujarat who carried our twins has been paid well and is happy and we regard her now as part of our family."
Chris, 40, a marketing analyst, added: "I don't understand why in Britain you can't enter into a commercial surrogacy arrangement. The law needs looking at to save people from all the heartache and trouble of having to go to a foreign country.
"There must be many couples like us having trouble becoming parents who might want to try surrogacy, but find the red tape and hassle too much.
"We are a pretty determined couple , but it has been a very, very long and tough road. The world is ever changing and the internet has opened up so many new avenues. The Government needs to think about that."
Dr Gauri Gupta of the Rotunda Clinic, who implants embryos in Indian surrogates before they go into the care of Dr Soni, said: "Surrogacy is spreading at a very fast pace here and there have been very few complaints. It is a very helpful way for people who could not have children before to become parents and we are seeing more and more couples from the UK every day. Our email inquiry box is full of messages from people from all over the West."
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