Look here:
http://www.sbsa.gov.uk/current_standards/th_html_2006/bsthd-69.htm "An electrical installation should be designed,constructed, installed and tested such that it is in accordance with the recommendations of BS 7671: 2001, as amended.
In a bathroom or shower room, an electric shaver power outlet, complying with BS EN 60742: 1996 may be installed. Other than this, there should be no socket outlets and no means for connecting portable equipment within such rooms.
Where a shower cubicle is located in a room, such as a bedroom, any socket-outlet should be installed at least 3 m from the shower cubicle."
