>>1094946*deep breath* here goes
think about things for a moment.
trespass is a civil, not criminal offence. if the police do get called they can't actually force you to leave- the landowner has to apply to the courts and so on to get you removed ( just think of the hassle county councils have to go through to get pikeys moved on)
consider where you are. do you really think the police are going to respond in a timely manner to a callout that there *might* be someone camping out a semi-remote (as in more than half a mile from the main road system) that they will have to travel miles to get ton and then spend potentially hours searching for you. a big waste of man hours and removing the attending officers from the reactionary resource pool for probably the whole shift.
who is going to see you? if you're far enough from dwellings it should be fine, you might encounter a dog walker at some point but as long as you're not doing anything like felling trees ( just sat back reading a book say) you probably wont get a even seen unless the dog runs over fora sniff)
just keep the noise down, don't build any bonfires and you really ought to be fine. in over 20 years of doing this ( long before it was dubbed 'wildcamping' and became meme tier activity) in north wales i've had one, yes one, farmer spot me who came over to see what was going on. within 2 mins of talking to him he realised i wasn't a chav with beers come to harass the sheep and asked me not to hop the fence and that there was a stile about 300m down from where i was leading back into the woods.