As ME noted, pizza sauces are very much individualistic and the hardest part of a pizza to recommend to others, so you should go with the types of flavors and textures that you
like in a sauce and ignore everything else for the time being.
As an example of the types of seasonings that can be used in a pizza sauce, see the list of ingredients for a popular U.S. pizza seasoning at http://www.penzeys.com/cgi-bin/penzeys/p-penzeyspizzaseas.html
. If you like those seasonings, you may find that there is a comparable pizza seasoning where you are in the UK.
When I was at the Sainsbury website and looking at the ingredients lists for the frozen pizzas, I also saw several different pizza sauces with different seasonings. Here is a typical example, for a Sainsbury Mediterranean style pizza:Tomato Sauce contains: Water, Tomato, Tomato Puree, Sunflower Oil, Sugar, Maize Starch, Salt, Garlic Puree, Sundried Tomatoes, White Wine Vinegar, Garlic Powder, Black Pepper, Yeast Extract (contains Barley), Tomato Paste, Rosemary, Tomato Powder, Cheese Powder (from Cows' Milk), Natural Flavouring, Basil, Marjoram, Oregano, Thyme
That is a fairly elaborate sauce but here's a couple of simpler ones, for a Sainsbury pepperoni pizza and a Sainsbury Basic cheese and tomato pizza, respectively:Tomato & Oregano Sauce contains: Tomato (With Acidity Regulator: Citric Acid), Water, Tomato Purée, Sugar, OreganoTomato Sauce contains: Water, Tomato Purée, Maize Starch, Basil, Sugar, Garlic Purée, Black Pepper, Cheese Powder (from Cows' Milk)
And another, for a Sainsbury regular cheese and tomato pizza:Tomato Sauce contains: Tomato (94%), Onion, Sunflower Oil, Sugar, Salt, Garlic Powder, Citric Acid, Parsley, Black Pepper, Chive, Basil
If you want heat, you can also use red pepper flakes or cayenne. Paprika is another fairly popular ingredient for a pizza sauce.
As you can see, the sky's the limit. So you should use what you like.
If a recipe calls for a tin of tomatoes, to me that means the entire tin, water included if the instructions do not specify that the tomatoes should be drained. If a particular brand and type of tomatoes is mentioned, then a tin in a recipe would mean a tin. If no brand is specified, you should be sure that you have the right type of tomato (e.g., whole, pureed, crushed, crushed with puree, paste, chopped, etc.).