I didn't want to post that sort of information so won't go down that road.
Instead I just downloaded the Electron Cash wallet from the link you posted. Came up as a Trojan straight away, so after cleaning my computer I went to the proper website for the latest version. However this did not help any, it only found a very small fraction of my funds which is not worth bothering with. So I think I will give up on this.

Ah, all right.

Problem - the Blockchair site gives a strange result. It does not recognise that I had a btc balance at 1st August; it thinks all my deposits were spent. But they are not, I had a balance of about 3/4 btc.

So - if I try to recover bcc/bch from this bitcoin core wallet, can I be confident that I can claim something? The previous link you posted makes no sense, as I'm not interested in creating a paper wallet which is all it is promoting.

To set up an Electron Cash wallet - fine. I can provide private keys, fine. But do they use the Blockchair system of calculating btc balances, or is that done another way? I'm not sure I want to go though that process and be told there is nothing to claim, when I know there certainly is. I cannot understand the Blockchair process that came up with such a wrong result.

Can you give some insight into what goes on behind the scenes?

That site has 4 topics but every one of them links to How To Make A Paper Bitcoin Wallet.
In any case, it's not the PK I'm worried about just now, I didn't need it at the Blockchair site, they just asked for the wallet addresses. I haven't got to the stage of wanting to import keys, I'm still wondering where my btc balance went...

BTW I had to change the link to bitaddresses because the other one does not work.

I thought I made it clear that, at fork time, and well before that too, there was a definite unspent balance in my wallet.

I even repeated the blockchairing exercise just to make sure I had all the details right. This is not confidence-inspiring.

This is something I would like to do, but I'm not even getting past stage 1!
I got on to Blockchair all right, but not happy with the result. I wonder if anyone else had this experience.

I have a Bitcoin Core wallet, and there was about 3/4 btc in it at fork time. Submitting my addresses to Blockchair came up with all my deposits OK, I can match them to my wallet history - but then Blockchair informs me that all those deposits - minus a tiny 0.002 btc - were spent! So there would not be any bcash worth pursuing. I don't think that represents the "situation on the ground".
So now the question is - which logic is used when claiming bitcoin cash? Is this based on the Blockchair results, or does Electron Cash do it some other way?