Credit line for a private limited company

Sorry, if this question is slightly off topic but I guess the audience of this forum might be the right people to answer this query.

 

I was wondering, if someone could share their advice/experiences on what sort of factors large banks look at, when deciding whether to not to offer a credit line to a private limited company. Initially, we were told they would usually asked for the last 2-3 years audited statements. What sort of a chance does a company have to get a limit - with 1 years audited statements + 18months account history with the bank.

 

Also, how do they usually decide the amount of the limit?

 

Thanks