Unbelievable, no offense, but I laugh so hard with the occasional person who says, I'm hesitant to give out my account number, who knows what they can do.
There are Two different things,
Card number, and Account number.
Accountnumber and Sortcode, people can only put money IN.
Number on the card itself, along with Expiry date and Security code. Money can be taken OUT.
Obviously you give only your Accountnumber out.
LOL.