One of those two polls, by Ipsos MORI, said the lead of the Conservatives was equal to that commanded by former Prime Minister Margaret Thatcher before her 1983 landslide victory.
The Times also said its YouGov poll showed that for the first time since June's Brexit vote more voters believed that the referendum decision to leave the European Union was a mistake than those who thought it was the right decision.
Forty-five per cent of respondents thought it was the wrong decision compared with 43 per cent who said it was correct while 12 per cent said they did not know.
British voters split 52-48 per cent in favour of leaving the EU at the referendum which the Government has said cannot be reversed.
May, who replaced David Cameron as prime minister shortly after last June's referendum shock, repeatedly ruled out a snap election until April 18 when she announced the June 8 vote.
May is seeking to bolster her majority in parliament ahead of potentially disruptive EU divorce talks and has gambled that the low level of support for the Labour Party under left-wing leader Jeremy Corbyn gives her a good chance to achieve that.
- Reuters, AAP
