Provided you're not intolerant to lactose, most varieties of whey are probably fine. MyProtein and Bulk Powders are probably the most reputable good value companies in the UK for this. You won't need to more expensive whey isolate varieties, and these are just a bit more pure but for quite a bit more money.
You're probably best aiming to get good quality protein from a variety of sources, though, just to make sure you have a balanced diet (also an over-reliance on whey will give you whey flatulence if you're anything like me, even though I don't have any digestive problems with dairy...).
Also consider fish (tuna, salmon, trout, cod, monkfish and smoked haddock are my favourites), turkey, pork (under-rated lean meat if you get the right cut), natural/Greek yoghurt, quark, cottage cheese, nuts, pulses and wholegrains (quinoa, oats, linseed, lentils, chickpeas, beans, etc.), and good old milk. Don't discount the protein in veggies too - peas and broccoli for instance both have reasonable amounts of protein as well as vitamins, minerals and fibre - and soybeans, of course.
I get 190g protein per day without too much bother by concentrating on these foods, with only one scoop of whey with my breakfast. It's just a matter of getting a handle on the rough protein content of various foods, and then once you have a few staple meals you can chop and change pretty easily.
After a month or so I find myself just working this out fairly automatically (like last night: my wife and kids had fish 'n' chips, which I didn't want as I'm cutting fat. A quick rummage through the freezer and I made myself a couple of fillets of smoked haddock with a heap of quinoa, green beans, broccoli and peppers - 450Kcal and 50g protein it worked out to, and with some greek yoghurt for dessert I was easily over my desired protein target for the meal. I stir-fried the veggies in garlic and soy sauce too, so it wasn't bland - you don't just have to stuff yourself with chicken breast!

)