Every body have to understand what are the security check and criminal checks......Your police clerance report is a proof of your criminal record in any country. If it is once clear they dont put hassel by going door to door to investigate that police clearnce. For Security checks they have a on line system to check , wheather your name is not listed in wanted persons or terrorists in UK, Australia, USA and Newzealand. Bec they share information with these countries in detail at CSIS data.and for other countries too offcource share information for their top wanted persons. It also take just a click to search and decide wheather your name is listed or not. I hope it will help you to understand the whole process.
our c
if u have stayed only 3 months in uk on visit visa do you have to present ur police report to CHC
if NO
than
will they still need to check crimnal checks in uk
is uk share data for people's who have deported from uk or have minor criminal record with CSIS