Where have you mounted your tax disc?

[Fazerider]

Since failure to display attracts a £60 fine, keeping the tax disc in your pocket or under the seat is a risky business. It'd be a harsh copper who issued a fixed penalty notice, but they exist, particularly if you've attracted attention through a breach of speed limits, for example.
I display mine on the screen, though if I had to park in less secure areas I'd use a decent colour photocopy and keep the original in my wallet.