25 and 50 fps is normal in the UK. Compared to 30 or 60fps in the USA.
But I'll answer this myself for those who have the same Question. …
The only way to achieve 50fps is to use the Transport Stream (MTS) option, Custom, you should be able to set as H.264, 1920x1080, Progressive, 50fps an export option.
I did this but it is not as smooth in playback, looking more like it had been reduced to 25fp.Hope that helps!