How to make 1 milion pounds ?

Working for people will not make you a millionaire, unless yo are a CEO, or you get a serious pay package.

Well I am not totally sure, but I think I know this may work.

1) You need a little money to start off. So you may have to work for someone or some organization to start off with. Best if you are working and doing what you are good at. During this time, learn as much as you can about what biz you can start in the near future. If you are good at something, that may be a good line of biz you want to start, otherwise learn something that have potential. If you see biz that you think you have the capabilities to do it. Learn as much as you can in that biz. Work in it if you can, that way you learn things from the inside, while accumulating a bit of capital. Also, befriends with those in that biz who have experiences in different areas from operations to management levels. As i was saying learning is the key. You want to learn as much from books as well as experienced people. Also, learn how to start a small biz from books and from people who have done it.
2) Start you own biz. Get your biz going so you can stand on your own two feet. So you can make decent profit.
3) Getting other people to make money for you. If you are the only one operating in your biz. There is only so much you can make because of limited time and resource and man power. So, you have to get people to work for you or sell you products or services for you. they may not have to work for you literally, but they have to be in the process of making money for you. They can be your resellers, contractors, or employees. Even a person who can make you $100 a day, 10 people = $1000 and 100 people = $10000 per day. That is the mathematics.
4) Once step 3 is happening you are already on your way. Still there are more things you can do. Try to get a trusted person to manage your biz, so you can free yourself to do other things such as
a) expand your biz or operations or expand to other locations, expand to other markets. Even international. I would try to expand within the country first.
b) diversity your biz. So you may want to start or buy out other profitable businesses. They can be totally different from your current biz or they can be closely related. Example, A car mechanic biz may want to own other car related biz such as car wreckers, car dealers, car tires, auto spare parts, car rentals, panel beaters, car wash, car detailers.
c) Money can make money. So you may want to invest your profit money into properties, shares...etc. This way you are getting the money to do some work for you.

During all this process, it's really important to gather loyal people who can help your biz grow especially friends and employees. You can train a reasonably intelligent person to do a specific job, but you can never train honesty and loyalty. It either they have it or they don't. Just like a military general needs loyal soldiers, a CEO/boss needs loyal employees.

I hope that helps. Start small and finish big.