Beautiful crab cakes

Name: Beautiful crab cakes
Ingredients: 500g potatoes, peeled and larger ones halved; sea salt and freshly ground black pepper; olive oil; 500g mixed white and brown crabmeat (2:1 brown to white), from sustainable sources, ask your fishmonger; 2 lemons; a few sprigs of fresh flat-leaf parsley; ½ a fresh red chilli; 3 spring onions, trimmed; SALSA; 1 red pepper, quartered and deseeded; 10 cherry tomatoes, on the vine; 1 fresh red chilli, halved lengthways and deseeded; 1 spring onion, trimmed and finely sliced; 3 tablespoons extra virgin olive oil; a few sprigs of fresh basil