Do you mean, a website for a "real-life" agency... to meet people. Or an online one.
If its the online one, then i'll reccomend http://love.lycos.co.uk/lovelycos/
I met my boyfriend on there 14 months ago :o)
www.ukpersonals.net
I met my girlfriend on there two years ago, and we're both very happy! It's free but you have to register (they don't abuse your info) Most ads have pictures so don't be afraid to post one.
Good luck!!