Yes its legal in india as its my first and only legal marriage in that country and rules of uk dont implies in india.
"I have just got this below information from findlaw.uk website can u also tell me whatbit means?
What if a person legally married in the UK marries someone else abroad?
Being married to more than one person at a time is recognised in England and Wales if it took place in a country that allows marriages of this kind (not in the UK) and both parties were legally free to marry in this way. Therefore, if someone legally enters the UK and already has three wives under a foreign law, then they will not be considered to be committing an offence in the UK (provided they do not enter into another marriage ceremony within the UK).
However, this may also mean that someone who is legally married in the UK could potentially marry someone else abroad, as marrying abroad means that the offence of bigamy under UK law is not applicable. However, he or she may be guilty of an offence overseas depending on whether the county he or she marries in criminalizes polygamy.
The Immigration Rules state that a person should not be granted a UK spousal visa if their marriage to the UK sponsor is polygamous and there is another person living with the sponsor in the UK who is also their husband or wife. Therefore, a man married in the UK cannot obtain a spouse visa to bring a second wife into Britain.
In 2008, the UK government gave the go-ahead for husbands with multiple wives to claim extra welfare benefits, so long as the weddings took place in countries where the arrangement is legal (as is permitted under Islamic law)."