Just a reminder that you don't have to tell them anything or show them your card. They ask for it in a way that suggests this is an obligatory part of the voting process. It isn't. It is just so the political parties can find out who has voted and who hasn't so they can chase up supporters of theirs who leave it late in the day to turn out, they said. Not too sinister. The choice of telling them or not though is up to you.
My objection is that they ask you for your number as you approach in a manner that suggests you are obliged to give it; as though they are election officials. They are not. The officials are inside the polling station, taking your card and giving you your ballot papers. The people in the rain outside are party activists. They are usually wearing party badges - so not hiding - but still implying they are an obligatory part of our voting process. They are not.