Not sure if I should be worried about this. I probably should, but I very belatedly swapped the summer tyres back on today and as per usual had a good poke around each wheel well to make sure everything was in order.
Spotted this via the driver side rear wheel well. The bracket supporting the 3 pipes was glistening. Obviously wet with either fuel or brake fluid. Brake fluid level was fine, no change from 2 weeks ago and I couldn't smell fuel.