Here's an idea Once you've found it ( and you will ) , make sure you keep all your important documents in one place ( a specific drawer , folder , etc . ) . That way , you know where they all are when you need them .
I usually keep them all in a box under my bed But that idea seems to have failed somewhere along the line!!
I beat that by a year! Thing is, I use Kev's advice and keep them all in the same place - Barnsley. Somewhere. Most of the time.
Just apply for your tax disc online they run a check on the central insurance database to see if you have insurance - you don't need the actual documents. http://www.direct.gov.uk/en/Motoring/Motoringtransactions/BeforeyouapplyD/DG_10034732