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cjr
Right, just unwrapped my bar tape and had a mess around with it. As soon as I unclamp the shifter, all play in the lever is gone! Once I reclamp it and pump the brake a few times, it comes straight back. Repeated this a few times to confirm.
I have the hoses attached under the tape on my Canyon Aero bars with electrical tape and I wondered if clamping the shifter was pulling the hose so I clamped the shifter higher up the bars to give the hose some slack, and, as if by magic, no play :)
I won't have time to try a bleed until the weekend but I'm fairly confident that it will be ok now.
My guess from how much bar tape was bunched up under the front of the shifter is that I've hit a pot hole and the shifter has moved down the bars slightly, pulling the hose with it. No idea why this would cause the symptoms that we both experienced though I'm so glad I found your post!