It's that attitude that got " wild campers " during the pandemic a bad name which messed it up for genuine leave no trace bushcrafters and wild campers, to the point where certain areas that had tolerated it began to talk about a total ban on wildcamping. I know dartmoor was seriously considering it, and also places in Scotland where it is more tolerated.
Stealth camps were all over you tube encouraging people to camp in silly places like roundabouts.
Always ask. It's polite and shows you have some idea of responsibility.
Near me, is an area of woodland that belongs to an estate. It was covered in fire scars and messy abandoned tents with broken gin bottles, cans, faeces, and torn down live trees that they had attempted to burn whole!
I spent some time clearing up the mess they made, and it took a long time. Made me and the landowner furious. Still, I got me some brownie points with the owner, and though not allowed overnights, have daytime access over a certain part of the land, as they know I will keep my eyes open and report trespassing activity.
If you were to just pitch up and set yourself up for the night there, I'd be turfing you off! No questions asked.
You are trespassing, and lighting a fire is criminal damage. End of.
Always ask. It's polite and builds trust.
I'm afraid,the "just do it anyway, its not a crime" attitude, is not what this forum is about, or condones.
It's trespassing , and if you light a fire or burn wood, break branches etc it's criminal damage. If you don't regard that a crime, how would you like me to pitch up in your garden unasked and do just what I fancied?
You'd be calling the police in no time, and getting me carted off wouldn't you?
Set an example mate... Don't be a donkey.