Radio Code is a trading name of ASW Solutions (UK) Ltd.
The majority of car radios can be removed from the vehicle fairly easily, without the need for specialist tools. Including but not limited to Blaupunkt, Clarion, Ford, Peugeot, Nissan, Citroen, Vauxhall, Philips, Rover, Siemens VDO and more. An alternate removal guide is also available.
The radio removal keys in this example look like the following illustration :
On the front of the radio, there will be between two and four round holes towards each corner of the unit.
Insert either either a cheap set of removal keys (as illustrated) or small screw-drivers into these holes and gently push them outwards
This should release the clips allowing you to slide the radio out. Remember, the radio will still be attached to the vehicles wiring.
Once its out enough, simply remove the antenna connection and the wiring block if required, or locate the serial number leaving the connections in place.
For a more comprehensive guide, including videos, take a look at FitAudio.com 
