Will I be an illegal over stayer if......?

Hello Everybody! A question: I am Canadian, my wife is Scottish. I am currently living in the UK on a Spousal Visa. We will be moving back to Canada around the time my visa expires. We will be waiting for my wife's Permanent Residency application to Canada to process and the time frame cuts it a bit close. I obviously won't be working once my visa is up, but can I stay past the expiry date of my visa or will I then be an illegal over stayer? Can I take a weekend outside the UK and come back into the country as a tourist? Any help would be much appreciated.

The best advice i can give is to contact an immagration lawyer in Glasgow as they will be able to advise you.
You would be illegal if you over stayed your visa and it would make it harder to get a visa to visit UK again.