How do I slow cook a beef joint?

[Madratlady]

I want to do a slow cooked beef joint for dinner tonight. How long does it need to be in the slow cooker for and do I need to add any liquid?

Outgrows I repot veg in the bottom, and then I mix up a rich beef stock pot with about 1/2 pint of water and throw that in, then put the meat in. I leave it for 6-8 hours on low.
You can use red wine too! :)

Stupid phone!!
Meant to say I put root vegetables in the bottom....