I have my A4 PLOG printed out, plastic sleeves on a ring binder which contain every plate for all airfields en-route, plus a few instrument approach charts for local airports I am familiar with. I also have 2 copies of a Archer II checklist, the AIS Lower Airspace Radar Services map you can find in Pooleys, and the boundary zones for the different areas covered by Farnborough Radar. I have a couple of spare pens attached, a little ruler tucked in the back, and mine even has a little flexi light attached to the back. I use a Pooleys A4 kneeboard, and all this lot can surprisingly be arranged very neatly. I go on the theory that I will take up as much useful information I can with me, then I dont have to panic should I need to plan a diversion.