Decided to to a max out level up play through of Mass Effect 1(this means that i play through the game enough times that my character can not level up any further) so that i have a new playabel ME1 character for ME2.
Just as i was about to start i remembered a light bug with the Pinnacle station DLC, went to the MEwiki to confirm it, and true enough.
On the Xbox 360, sometimes Pinnacle Station is not accessible with Bring Down the Sky installed. This occurs when Bring Down the Sky is installed from the Platinum Hits bonus disc. The solution is as follows:
Delete Pinnacle Station and Bring Down the Sky
Clear system cache
Download Pinnacle Station to hard-drive
Re-install Bring Down the Sky from Bonus Disc
This should allow you to use both DLC packs properly.
Now, i'm a bit confused about the 'Clear System Cache' point.
I don't think I've ever seen that particular bug on my 360 and I've been through the game several times. I will admit to largely ignoring Pinnacle Station though...I didn't care for that particular bit of DLC.
"You'll find that many of the truths we cling to depend greatly on our own point of view."