On Monday I was out for my exercise quota near Little Budworth, Cheshire in the lanes, and I heard a low growling. There had been loads of motorbikes about that afternoon, mostly in groups, and I thought more were coming. But two biplanes appeared flying low and I stopped to watch them. They were very low and passed me on my right, silhouetted darkly against the sky so I couldn't make out any colour. Initially I thought they were a pair of Tiger Moths, with a typically narrow front profile and wings with a backsweep but the tail fins looked wrong, no rearward almost oval sweep to them. That bugged me for a while, I can usually identify vintage aircraft, as I grew up on airfields.
A roadie came tearing past while I was watching them go by, who must have been in a world of his own, as he didn't even look up. A bit of a treat for me anyway, even if I didn't know what they were.