Page 1 of Wharfdale 750s PAL DVD to NSTC TV

I have moved to Canada from the UK. I`ve multiregion hacked my DVD Player and set the output signal to NSTC. I have had no problems playing any of the DVD`s I`ve rented here on my new TV. It will even plug directly into a 110V outlet without the need for a transformer. However, I have a few DVD`s that I bought in the UK (PAL) that won`t play on a NSTC TV. The manual says that you can play NSTC DVD`s on a PAL TV, but not PAL DVD`s on a NSTC TV. Is this true as the Wharfdale 750 & 750s seem to be capable of much more than the manual states?

If it`s not true then how can it be done?
If it is true then is there any way to convert a PAL output to NSTC?

Thanks in advance for any info.