Canadian mains supply is 110V 60Hz, as USA. The TV will not work with a UK TV signal as we use a different transmission standard here.
In my experience, ex-pats often keep a TV and VCR of their native land with which to watch old tapes and home videos sent over. It might be changing now as modern TVs and multiregion DVD players can play both standards.
To check if other equipment will work, first check the manual to see if there is a voltage selection switch. This will need to be set to 230/240V. Computers (especially laptops) generally have this facility, in fact some automatically switch.
High-powered appliances that cannot work of 230V will be pretty much useless. Voltage convertors are always "rated", that is it will be suitable for use up to a certain power (wattage). Big appliances may exceed this wattage.