Play FMT-1 iPod / MP3 Micro FM Transmitter is just £9.99 inc Free delivery from Play.com
Apparently these devices are legal since yesterday.
Description : Full-frequency FM transmitter - allows playback of iPod, MP3 player, CD player or other device having a standard 3.5mm stereo headphone socket via any FM radio. Compliant with the European Union's CEPT regulation for short-range devices.
Features : Transmits on any frequency between 87.5 and 108.0 MHz to avoid interference | Large LCD display with blue backlight | PLL technology ensures stable drift-free reception | Three memory presets for most-used frequencies | Automatically stores last used frequency to avoid retuning | Temperature display | Time display | Built-in mini torch | Powered by 2 x AAA batteries or supplied car adaptor | Range: >15m | Current: 38mA | Voltage: 3v DC | Effective radiated power: 50nW | Channel separation: 65dB | Frequency response: 20Hz - 20kHz | Output frequency: 87.5 - 108.0 MHz | Dimensions: 76 x 44 x 25mm | Weight (exc. batteries): 55g