How do I take the front panel off a Creda storage heater?

Some weeks ago, a candle melted into the grill of my storage heater, setting off fire alarms, etc. I don't think it was very much but I am worried about turning the heater on again incase smoke starts pouring out at 3am!
I have switched it off, but need to remove the front panel to remove the wax....as i am now freezing!
It is an oldish model (grill on the top of heater) and I am unable to identify which model it is.

Any ideas? Or should I just get an electrician in?