Speeddate makes it quite a bit of a hassle to find the deletion option. Actually you can find lots of complaints on the web about it.
Use the link to request removal. Fill in the data, choose option 6 (Opting out) and then the option ‘Please remove my profile’.
Another option is to deactivate your account, using: http://www.speeddate.com/#index.php?page=profile&action=account
(scroll down for deactivation.)