Diagonals

..... or maybe Diamonds.

The tiled roof of St Peter's Church - this patterning is something easily missed. But then that's what blipping does - you just pay more attention to patterns and textures. 

This is a rather fine 19th century church. Probably taken for granted by lots of people, I think it's a bit of a gem. The gothic revival of the 19th century has left us with a lot of gems.