The government should make 2 meter gap compulsory measure at any public place.

The people only listen to laws set by the government.
I have observed that people do not follow unless government impose such restrictions.

Since you started your petition the Governemnt has passed legislation giving the police new powers to instruct people to go home, leave an area or disperse, and issue fixed penalty notices if people fail to follow an instruction: https://www.gov.uk/government/news/police-given-new-powers-and-support-to-respond-to-coronavirus

You can find out more about coronavirus and how you can protect yourself and others here:

www.gov.uk/coronavirus
https://www.nhs.uk/conditions/coronavirus-covid-19/

The Government has also created an online service to help you out what you can do if you’re struggling because of coronavirus: https://www.gov.uk/find-coronavirus-support

You can read NHS tips to help if you are worried about coronavirus here: https://www.nhs.uk/oneyou/every-mind-matters/coronavirus-covid-19-anxiety-tips

You can read impartial analysis of the Government response to coronavirus and policy developments here:
https://commonslibrary.parliament.uk/coronavirus/

You may also be interested to know that because of the large number of petitions that have been started in relation to coronavirus, the Petitions Committee has been questioning the Government about its response to the coronavirus outbreak.

Find out more and watch the Committee put questions suggested by petitioners to Government Ministers and the Deputy Chief Medical Officer: https://committees.parliament.uk/committee/326/petitions-committee/news/145767/committee-question-deputy-chief-medical-officer-and-ministers-on-coronavirus-response/

Read letters asking further questions of Government Ministers: https://committees.parliament.uk/committee/326/petitions-committee/publications/3/correspondence/