So that's what it was!
I was on the M25 earlier heading west towards the A1 junction and noticed something in the distance.
First few glances it looked decidedly triangular. Can't be a UFO, can it?
.. wrong shape for a blimp.. same for a plane drawn banner.
Finally I realised it was one of those helicopter drawn banners but I couldn't make out what it was advertising.
I was on the M25 earlier heading west towards the A1 junction and noticed something in the distance.
First few glances it looked decidedly triangular. Can't be a UFO, can it?

Finally I realised it was one of those helicopter drawn banners but I couldn't make out what it was advertising.