Ok just updated to mythtv 0.20,(following cecil's instructions http://mysettopbox.tv/phpBB2/viewtopic.php?t=11558 )as it sates it now has MHEG and radio support.
Radio works fine but i have no idea how to access the Interative stuff.
My red button my hauppuage remote is curently mapped to display mbmon info and i cannot find any info in the keys.txt or the mythtv doc.
The only thing i found was a reference to the T button but pressing that just brings up subtitles: english on / off message? Please can somone help me out.
Tanks in Advance

EDIT:
OK finally worked it out myself, under settings- tv settings - playback then on the On-screen display page theres an Enable Interactive TV checkbox, once checked use buttons F2-F7 called ITV-red ITV -Menu etc