Where can I bid for commercial work?

Hi, Looking for a good tender for contracts website where I can bid for commercial work and has anyone used a service like this?

Hey Buddylove.I wish i knew chap,id be doing it.If you find out,please let me know.

I currently approach Commercial Companies.A polite bit of cheeky banter,notice polite...That raises humour for a feel good factor.Then they may put an extra good word in for ya!.