Nick
Perhaps try cutting the dealer fit one down a little. The advertising bit at the top can be lopped off and just the disc holder bit left in place. The aftermarket tax disc holders are a bit tacky - the best one seems to be the magnetax - a magnetic disc holder.
I'm fairly sure Halfords or any motor accessory shop will stock these. They have 'Magnetax' written across the back. Consisting of a metallic ring that is stuck to the screen, the magnetic closing panel matches this ring and hey presto! a secured tax disc!
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