Problem with ATV refresh rates and frame rates

I live in Australia and as such I am subject to PAL, so when I set my ATV up I set it to 720P 50Hz, when I purchased a TV season the episodes were running at 25fps and played back flawlessly with no dropped or added frames. My problem occurs when I download movies, all the movies I have bought are running at 24fps and suffer from quite noticeable jitter, almost like the 24th frame is duplicated and added as the 25th frame, I assume it is something like this as the pause happens every second.
So has anyone had a problem similar to this and if so what do you do about it?
Does the ATV playback all sources (24/25) smoothly even if it has to convert?
Could it be caused by my TV?
Any help to any of these questions would be great.
Thanks.
Tim.

With my particular Apple TV setup and TV combination, I find that setting to 1080p (60hZ) gives my the best all-round round results.
This does result in -slightly- jerky motion with 25fps material (especially old British TV shows), but it's bearable. It's particularly noticeable with sideways scrolling text and credits.
The one thing that is peculiar on my setup is if I use 720p (either @60hz or 50hz) and watch an iTunes-purchased HD episode that is encoded at 24fps I get very odd motion effects indeed. Every few seconds the video appears to speed up almost like it is 'catching up' with lost frames - very hard to explain exactly how it looks. Anyway I set to 1080p and this effect is gone completely. It also goes away if I set to 1080i. I think something queer is going on with 720p on the Apple TV (at least with my TV there is). This happens with both HDMI and component outputs.
It may be worth trying 1080i at either 50 or 60Hz if your set can't do 1080p.
I would also suggest that 60hz in theory should give a smoother motion for 24fps playback than 50Hz.
My basic problem with all this is that on even a cheap DVD player if a disk is 50Hz, the player switches to 50Hz output and if it is 60Hz, it will change to 60Hz. The Apple TV stays fixed. It's a shame it can't autoswitch refresh rates.

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