Hi @SkyePCock I have a ceiling swing, more info in link below from a thread very recently.
Best thing to do is go in loft an drill a small pilot hole next to the beam you want to hang from through to the room below and also measure from this hole to the cente of the width of the beam so when you drill up from the bedroom you are using this measurement to find the centre of the beam.
You can also put metal beam strengtheners up on either side of the beam you have used in loft too for extra peace of mind. Don’t cost much and are just screwed or nailed to the beam.
Ours has held up all this time.
Good luck and enjoy