It seems that when I do the bit where I create a new identity in scatter it tries to find the accounts matching the keys on the server, sometimes is says it can't find any accounts, but if you retry a few times, eventually it does.
That's a little bit disconcerting, but eventually I did manage to vote.

What's more disconcerting, is that when I did get the identity added, there's a new identity element available at the top level in scatter, and a little button with a circle icon next to the pen icon, and when I click that it shows the balance against that account. It says "Loading token balances", then says I have 10 EOS tokens. I should have a lot more tokens than that, and I've got no idea why it's saying 10, but it's a worry.

Meanwhile, sites like https://eoscountdown.com/ and https://eosauthority.com/ show a number of tokens against my public key that is what I expect.

What am I not understanding here?