I think 30ma is about normal. There’s a good reason, in an average socket ring (or even radial) you will always get SOME leakage. So there’s always going to be a common sense allowance made depending on whether it’s a single socket, a small radial or one or more rings.

Yes, and 30mA, even at mains voltage, will not kill someone. Static shocks can vary from 1,000V to 500,000V and are usually around 5mA for reference.