Bellack Calor Gas Cooker?

I bought a second hand calor gas Bellack, I don't know what got into me as the previous owner has cleaned off all the control and identyfing markings, even the label on the back. I could barely make out that it is a Bellack, but have no idea what model or how to use it, I have never owned a cooker with the grill in the oven. It is a stainless steel version. Anyone know anything about it? Can anyone tell me:
1. Where I can get an instruction book about it?
2. How I use the oven and grill?
I will get my local Corgi agent to install it.