Easy healthy falafels

Name: Easy healthy falafels
Ingredients: 250g dried chickpeas or dried split broad beans; ½ tsp bicarbonate of soda; 3 garlic cloves; 1 onion, roughly chopped; 1 leek, roughly chopped; 1 celery stick, roughly chopped; 1 small chilli, roughly chopped (deseeded if you don't like it too hot); 1 tsp ground cumin; 1 tsp cayenne pepper; 1 tsp sumac; good handful chopped coriander; good handful chopped parsley; 80g gram flour; 100ml vegetable oil; houmous, tabbouleh and pickled red onion & radish (see goes well with), flatbreads, shop-bought or see goes well with (optional)