Is giving bank details risky?

[WeAreOnTheRoadToNowhere]

Family member owes me some money so plans to set up a standing order
They haven't been too honest in the past. Is there any risk in me giving out sort code and account number?

They can’t take anything with those details, only pay in

Technically no, these are a matter of public record. This information is written on a cheque you hand over, for example.
There is a fine example of someone setting up a charitable donation Direct Debit for Jeremy Clarkson once though:

news.bbc.co.uk/1/hi/entertainment/7174760.stm

But I think this could’ve been reversed under the direct debit guarantee - he just chose not to do that as it was a charitable donation and so he didn’t want to take the money away from a charity.

You are fine to give your bank details out. I work for a bank.

Thanks
I thought it was safe (ish!) but wondered if I'd missed anything
It can't be used for payment as that's the long card number and my bank asks me if I've set up a new DD
Family member is also a vulnerable adult and has been scammed in the past so I feel a bit twitchy

If you don't give them then how will this person repay you?

They probably won't as they never have cash. I just wondered if it was worth the risk

Actually , be careful. Someone got hold of my bank details and set up a direct debit for their council tax with Cheshire East. Cheshire East council didn't check that I had agreed to it, I noticed after a couple of months as I barely use my UK account because I have lived in Spain for many years.

I got the money back through the bank but Cheshire East told me that they don't actually check with the account holder that they have agreed to the direct debit (!) and that they were "sorry".