Talk

Anyone?

Postal order? Bankers draft and ask the bank to keep it anonymous? Do you have any way to access their account details (paying in slip or something) and pay cash into their account?

If you've got their bank account details, you can pay in directly.
Otherwise, cash.

It's possible a counter cheque issued to you by a bank would achieve this - then the bank would know you'd asked for such a cheque obviously, but the charity I think wouldn't.

It's a someone who has asked a third party how to make a donation to a charity I'm involved with. I don't know how much it will be, so don't know if PO is feasible. Is there an upper limit?

Would an electronic bank transfer show the source account name on our statement?

In my experience, when I send money from my current account into my daughter's using telephone banking, I am asked to give the sum a name. Generally I get the assistant asking, "Will she know who it's from or do you want to give it a title?", resulting in me saying something like "Oh, can you put 'flowers' please", so she'll know it's for the flowers she ordered on my behalf".

Sure enough her statement shows TFR Flowers £50 (TFR = transfer). If I didn't give the transfer a name it would simply show her account number plus the sum.

This suggests to me that your benefactor could either just leave the details showing nothing but his/her account number or, if they feared being recognised by that, could opt for a description, e.g. "Church roof", or "donation".

If I make a transferal into DD's account online it will show up as the sum plus my account number so if your benefactor wants to avoid that, a call to his/her bank is the way to go.