will my chances increase to get into medical school in the UK if i have a BSc degree already from u of Toronto

The admission requirements to UK schools vary. The General Medical Council is the authority over all UK med schools and even on their web site they state that you need to contact the individual schools for their admission requirements.

Here is the GMC’s web site, which will lead you to all of the UK schools: http://www.gmc-uk.org/

Another option is to research through IMED, the International Medical Education Directory: http://imed.ecfmg.org/

I don’t have personal knowledge of this, but I have heard the University of Glasgow has the easiest admission requirements.

they should U of T is a very highly regarded institutioin international and they have great med programs. I believe they are ranked 24th in the world in terms of top university.