Just thought I would return a little info since I this forum was a big help with replacing my radio in my Roomster.
I removed the stick "Dance" head unit and replaced it with a Kenwood DPX405BT - Double Din Car CD/MP3/USB with Bluetooth.
I ordered everything from Car Audio Direct, it was cheap and arrived quickly. Since I was clueless, I called the guy and got him to walk me through the pieces that I would need. He got most of it right.
I needed this facia plate and metal cage:
http://www.caraudiodirect.co.uk/ct23sk03a-double-din-facia-plate-for-skoda-fabia-2007-gt
And I needed these wiring gubbins:
http://www.caraudiodirect.co.uk/ct20vw03-harness-adapter-vw-passat-golf
And the guy forgot to tell me that I needed this to plug the aerial up:
http://www.caraudiodirect.co.uk/ct27aa01-aerial-antenna-iso-to-din-adaptor
Last but not least, here is the head unit I choose:
http://www.caraudiodirect.co.uk/kenwood-dpx405bt
You'll also need a torx screwdriver to get the old unit out.
The installation was pretty easy. The bluetooth microphone was very easy to mount near the rear view mirror and run the wire down the pillar. The plastic pillar snapped off pretty easily, the clips pop out and then slide up (or maybe down, it's obvious). The wire could then be tucked into the seal where the dash joins the door frame, then ran along underneath the fuse box. Then it's easy to go under the hole where the radio is and pass the wire up into the hole.
The only complication was that the unit I had wanted a separate 12v power supply that turns off and on with the key. This was supposed to be where the red lead was plugged into. I couldn't find any part of the wires that were feeding the radio that did that, so I popped into my local store, Whitton Car Audio. They joined the red lead to a keyed power line by popping out the vents with the hazard lights and finding a wire there to splice into. They charged me £25 and it took about 10 minutes.
After that, it was a simple matter of assembling the frame and cage, putting the radio in, plugging in the wires and screwing it all back in. After adjusting the plastic fascias, it all works as expected.
I'm a little disappointed that the head unit I got doesn't work so great with my Iphone. It's all controlled with Blue Tooth which is fine for answering calls, but crummy for controlling the content through the head unit. I've had other head units that gave you a menu of the IOS device, like Artists, Tracks, Albums, Podcasts and Playlists. You could choose one and narrow it down through the head unit. This one does not, everything is just kind of lumped together. There is a unintuitive search function, but that's a pain as well. Otherwise, you can press a button and tell Siri what you want to listen to, but that's only as good as Siri. Most of the time Siri gets it very wrong. I'm sure I'll get used to it with further use.
I was quoted £330 all iin from a different stereo store, and managed to get it all done myself for roughly £210. It took some time, but now I know how to do it.
Hope this helps somebody else if they want to do the same.
