The tester: Michelin-starred chef of York & Albany and Murano
She rated Marks & Spencer pepperoni pizza
She slated Pizzas from the Co-op

Pepperoni

Marks & Spencer Wood-fired
£2.99

Nice base, crisp and not too soggy. There's the right amount of filling and different types of pepperoni as well as red onion. I can taste the pepperoni throughout, but it could do with being spicier.
4 stars

Sainsbury's, Taste the Difference Etruscan Pepperoni & Pepper Pizza
374g £4.49

Nice crispy base with sliced tomatoes and mozzarella. Generous spicy pepperoni, but lots of dried herbs, which makes it taste quite artificial. Too many peppercorns as well.
3 stars

Tesco Deep Crust
441g, £2.38

Too much dough. There's only one type of pepperoni, and the cheese has gone quite yellow, which makes me think it's cheddar and not mozzarella, and the tomato puree seems quite sweet.
No stars

The Co-operative Stonebaked
330g, £2,79

Looks like they've thrown cheddar on it, rather than mozzarella. The pepperoni doesn't taste of anything, and the base is too doughy. The tomato sauce tastes like it's been sweetened with sugar.
No stars

Margherita

M&S Wood-Fired Buffalina
413g, £5.49

More like a foccacia than a pizza base, but the tomatoes taste in season. Cheese is creamy but there's not enough. Rather patchy and dry, and needs more herbs.
3 stars

Aldi Carlos Cheese and Tomato
330g, £1.19

It looks deep-fried! I really don't like the cheddar cheese taste, it's too strong and the base is terribly doughy. I don't think they've even used any herbs at all!
2 stars

The Co-op, Truly Irresistible
465g, £3.49

Nice thin base, but there's way too much watery tomato sauce, it's too sweet and acidic. There's not nearly enough pesto and the cheese tastes really cheap.
1 star

Morrisons, The Best
455g, £3.49

As if someone's tipped a herb shaker over it- an awful artificial taste. The tomato purée needs more salt. The dough is hard and stale. It tastes really cheap.
No stars

Four cheeses

Waitrose
380g, £3.99

If it had rock salt and more cheese on it, this would be really good. The cheese is strangely soft and slightly cheap tasting, but the dough crisps up well and doesn't go soggy. Could do with a bit more seasoning.
3 stars

Sainsbury's Italian Quattro Formaggi
300g, £3.29

I can identify the different types of cheeses, and the base isn't bad, but it doesn't seem to have any tomato sauce! The taste is OK, but they need more herbs.
2 stars

Morrisons Stuffed Crust Cheese Feast
465g, £2.79

All the cheese seems to be on one side. The dough's nice, and sauce is well seasoned but too sweet. I can only taste cheddar, and the cheese in the crust hasn't even melted.
2 stars

Asda Stonebaked,
400g, £1.50

It looks nice, but there's nothing else worth mentioning. No seasoning, can't taste the tomato, dough is too doughy and cheese is gross!
No stars

Hawaiian

Sainsbury's, Taste the Difference Yorkshire Ham & Chargrilled Pineapple
391g, £4.49

Good quality, thin, salty ham. There's not much pineapple, which I don't mind, the cheese is decent and the base is not too doughy.
3 stars

Waitrose Ham and Pineapple
435g, £3.99

Lovely base - really thin. The herbs taste good, but it needs more salt. There's substantial topping, but I don't taste that much ham. Could do with more cheese too.
3 stars

M&S Stone-bake
370g, £2.99

Hawaiian pizzas are wrong. I once broke up with a guy for ordering one. Oh no, it looks really offensive. Cheap sweet ham and sweet pineapple, yuk. And too doughy.
No stars

Co-op Stonebaked Ham and Pineapple
350g,£2.79

There's far too much topping, and the dried herbs make it taste artificial. The ham and pineapple taste all right, but the tomato sauce overpowers them.
No stars

Mushroom

Waitrose Mushroom and Mascarpone
440g, £3.99

Nice thin base. It's quite garlicky, which is rather tasty. Cheap mozzarella and mushrooms, but they taste quite good, though it lacks cheese, and needs more herbs.
3 stars

Tesco, Finest Italian Ham, Mushroom & Mascarpone
443g, £3.49

The tomato sauce is rich and the mushrooms are cooked well in garlic and herbs but there should be more cheese.
3 stars

M&S Wood-Fired Ham, Mushroom & Mascarpone
373g, £3.99

Very bready. The mushrooms taste nice, but the cheese is too creamy and there's not enough. Rather dry and could do with more herbs.
2 stars

Morrisons, The Best Portobello Mushroom and Mascarpone
478g, £3.99

The overall look is good, but the base is a bit thick and not seasoned properly. Cheap mozzarella, but the mushrooms taste expensive.
2 stars

• York & Albany, 127 Parkway, London NW1 (020 7388 3344); Murano, 20 Queen Street, London W1 (020 7592 1222)