SALMON NICOISE WITH GRIDDLED LITTLE GEM LETTUCE

400g Jersey Royal potatoes, halved • 21/2 tbsp olive oil, plus extra to drizzle • 2 x 220g packs Waitrose 1 2 Wild Alaskan Sockeye Salmon Fillets • 4 British Blacktail Medium Free Range Eggs • 200g green beans, trimmed and halved • 1 tbsp cider vinegar • ¾ tsp Dijon mustard • 1 small clove garlic, crushed • 2 little gem lettuces, each cut into 6 wedges • 100g Fragata Stoneless Manzanilla Olives Filled With Piquillo Pepper, roughly chopped