SINGAPORE - Former People's Action Party (PAP) MP Inderjit Singh has given his take on the 2015 General Election, in a lengthy Facebook post.

The vocal former MP said in Thursday's (Sept 17) post, which is more than 3,700 words long, that not withstanding the landslide victory won by the PAP in the Sept 11 polls, the ruling party needs to "develop a new social compact with Singaporeans".

He added: "The strength of a compact can give the current PAP leadership the same strength as the compact the pioneer PAP leaders developed, which gave the PAP leaders 40 years of trust of the people."

In the post, he analysed why there was an almost 10 per cent swing in the vote share back to the PAP, after a 2011 election which saw its vote share fall to 60.1 per cent, the lowest in a general election since independence.

Mr Singh admitted that he too was surprised by the election results. On Cooling-off Day, he still felt that the opposition could have gained some seats, and the PAP vote share would be around 60 per cent, he said.

But he went on to list the reasons for the PAP's victory, but said that there are "underlying issues the PAP should not ignore".

He wrote: "The PAP leadership has been handed a second chance to change its approach to build greater trust from Singaporeans. Failure to change and sticking to the old ways will be disastrous and the PAP should not betray the trust Singaporeans have placed in them as shown by this resounding victory in GE2015."

He also urged all Singaporeans to stand together after the election: "For now, I urge all Singaporeans to come together and work towards Singapore's progress for the well-being of all Singaporeans. The elections are over, let's all stand together as one united people for our country. Majulah Singapura!"

Mr Singh, 55, who was a Member of Parliament for Ang Mo Kio GRC from 1997 to 2015, announced in July that he would be stepping down before the 2015 election.