I’ve done this before and as Sod’s Law would have it I was stopped in a multi-agency check a week or so later. The copper who did the tacho check clocked it and said “I can see what you’ve done…” before he even asked me for an explanation. He asked me if I’d done a print-out so I said “Yes” and showed it to him but he really wasn’t remotely bothered by it. I guess they must see this fairly frequently.