I've got a 3 door VW Polo and need a rack for my bike. Would rather not get a roof rack as my daughter might need to borrow the rack for her bike (she also has a Polo) and she's only little.
What about these bad boys:
For three bikes:http://www.wiggle.co.uk/saris-bones-3-bike-rack/?utm_source=google&utm_m...
For just one:http://www.wiggle.co.uk/saris-bones-solo-1-bike-rack/?utm_source=google&...
I can also recommend the Saris - I have one for 2 bikes, it's easy to set up and folds down pretty small when not in use. It's also easy to mark the settings to make mounting it again easier.
My dad has a saris bones 3 and is very happy with. Although I am sure there was a recent thread on here about them not fitting the polo.