Cheesy leeky mash

Take 1kg potatoes, cut into even sized pieces, and put into a pan of cold water. Add 1 teaspoon salt. Turn the heat on. Wash and slice 500g leeks (including the green bits) and add to the pan. Bring to the boil. Once the potatoes are cooked, drain, add 150 ml milk, 20g butter and about 100g grated cheese, plus a good sprinkling of freshly ground black pepper to the pan, and mash roughly. Good with oven-ready fish in breadcrumbs/batter portions, and takes about the same length of time to cook. Feeds two starving teenage boys and two adults with normal appetites. I gave up peeling potatoes that I was going to mash some years ago. It's much quicker, tastes good, and gives a dish an appealingly rustic look. Extra fibre too. What's not to like?