Hi guys,
I beg to differ on this. You did the right thing in selecting UK as country of education for the ECA and it wont be an issue if you do the same in the EE profile.
In education history 'Country of education' is UK. This because you qualifications are UK qualifications not Sri Lankan. Where it then asks 'where this activity took place' (personal history) you put Sri Lanka.
You are required to write {by correspondence} next to the name of the institution to show that you were not actually in the country. This way you should not be asked for PCC.
"Applicants are instructed to indicate that their education was completed by correspondence by typing in brackets {by correspondence} on the same line as the education institution name found in the Education Background Information tab of GCMS. The discretion remains with the officer to decide if a police certificate is required for the country of the education institution."
http://www.cic.gc.ca/english/resources/tools/perm/express/intake-complete.asp
All the best