Awesome work you guys. I now remember switching that on whilst playing around a while ago and not really noticing a difference at the time (and not knowing what it would do anyway). It was only recently I noticed the transparency had gone so I didn't know how to fix it.
It's funny how there are some settings which find their way into iOS and don't receive any introduction from Apple. This is one I knew nothing about.
We're all set now. So thank you for you help.
Cheers
Ste