If you have permission from the land owner then target archery is fine and legal, no licence required.
Obviously you should take precautions to protect yourself and others. You don't want to hurt anyone and you don't want to be sued.
You should really only shoot where there is enough spare room around you, and if there's any chance of any public wandering into that area then you'd be better off if you clearly marked it out.
I'd recommend at least 20m either side of you, and 50m beyond your target as an overshoot.
Unpredictable things can happen to arrows with some larger angles of error than you might expect.
I've been shooting pointy sticks at pointless paper targets for a number of years myself
No one's been seriously seriously hurt or killed doing archery for a while in the UK. It'd be good to keep archery out of the Daily Mail and hence my reasons for being cautious. *grins*