Since ESOS (employee stock option scheme) is no longer available, ask as much as salary as you can. Although the bonus is good (2 month contractual bonus for permanent employee), but the increment is very bad.

Salary range given depend on hiring manager and your HR, as well as if your experience related with your current position or not.

If i am not mistaken, the fresh grad pay is about 2.3k. So, you just get a figure in your mind and try your best la. Good luck