It's easy, get a sponsor to support your artist lifestyle. Or get a part time job to minimally live and eat then live the life of a starving artist.
Assuming you want to to totally commit yourself to being a landscape photographer. In the United States there is little hope for anyone below the poverty line and in this country it takes a good amount of money just to live, food, shelter, medical, dental, insurances if you have a car, which is needed due to the vast areas landscape photographers need to travel to, and money for gasoline and emergencies and repairs. Some of those conditions probably don't exist for you in the UK but I image most apply without the medical / dental, I'm not sure what's provided. You can't have any large debts or any distractions that would interfere with your round the clock work.
If you only want to do it part time as a "breaking into" kinda of thing then approach it with the same commitment as a professional; business and art.
It would require that you are supported completely, by yourself or another, and have all of your time free to do your art without interference to your artist intent. It's a tough bill but realistically that's what it is all about.
"Millions must plough and forge and dig in order that a few thousand may write and paint and study." H.G. Von Treitschke