The first thing I did was remove the old cruddy bit of perspex on the top. Underneath, there was another bit of perspex covering the screen, which had gone yellow. There were two bits of cardboard covering the spaces for rotating the screen 90°. The black vinyl underneath the perspex was also past its used-by-date, so it had to be binned too. The vinyl came off in one piece, but left the very sticky glue behind. I removed the glue with some "De-solve it" (very handy stuff!) and sanded the top of the table. The top looked pretty good, apart from where someone obviously filled a hole in with wood putty.

After finishing the top, I sanded the inside of the cabinet a bit to remove excess splinters. The rest of the wires, staples and clips were removed from the cabinet and the remaining crud/dust was vacuumed out. I decided to paint the top of the cabinet instead of replacing the vinyl, as paint doesn't start to peel off after a few years.