Can anyone throw me a current average fee charged for emergency call-out these days?

It's very rare that I get anything like that, and then normally only for a neighbor or something similar. I got called a couple of nights ago about 8:30 p.m. for an overflowing water cistern and the attendant tripped RCD and flooded wiring. It's going to be an insurance job, so I want to include a reasonable emergency fee.

Thanks!