Potatoes are not one of your 5 A Day
The NHS counts potatoes as a starchy food, not a vegetable portion, because of their role as a staple carbohydrate in the diet. Sweet potatoes, parsnips, swedes and turnips do count.
The NHS Eatwell Guide places potatoes in the starchy carbohydrate group, which it says should make up just over a third of the food people in the UK eat. This site reports what a potato contains, how cooking changes it, how varieties differ and how it compares with rice, pasta, bread and sweet potato.

Five reports. Each covers one part of the subject and names the organisation or reference work its statements rest on.
Potassium, vitamin C, vitamin B6, folate and fibre in a plain potato, set against the UK reference intakes and the values in McCance and Widdowson's The Composition of Foods.
Where the NHS and Public Health England put potatoes, why they do not count towards 5 A Day while sweet potatoes do, and how the Irish, US and Canadian guides classify them differently.
Boiling, steaming, baking, roasting, frying and cooling: how each changes energy, fat, glycaemic response and acrylamide, with the Food Standards Agency's advice on browning.
Maris Piper, King Edward, Desiree, Charlotte, Jersey Royal and Rooster: floury against waxy, new against maincrop, skin-on cooking, storage in the dark and what green patches mean.
Boiled potato against white rice, pasta, bread and sweet potato on energy per 100 g, potassium, vitamin C, fibre, gluten, salt and 5 A Day status, using NHS and FSA positions.
The reports differ in detail. These statements apply throughout and come from the bodies named.
The NHS counts potatoes as a starchy food, not a vegetable portion, because of their role as a staple carbohydrate in the diet. Sweet potatoes, parsnips, swedes and turnips do count.
The fat in a potato dish comes from the cooking method. Boiled and steamed potatoes contain a negligible amount; roast potatoes, chips and crisps carry the fat they were cooked in.
Cooking and eating potatoes with the skin on keeps more of the fibre and some of the minerals. The NHS recommends 30 g of fibre a day for adults, and skin-on potatoes contribute to that.
swaylopixelscabn.courses is an independent reference on one subject: the place of the potato in a healthy diet in the UK. Statements about nutrition are attributed to public bodies and published reference works, chiefly the NHS, the Food Standards Agency, the Scientific Advisory Committee on Nutrition and McCance and Widdowson's The Composition of Foods. Nothing on the site is personal dietary advice. Readers with a medical condition, or with questions about their own diet, should speak to a GP or a registered dietitian.