Info on sea defences displayed on the seafront.

This hasn't come out as well as I'd hoped but gives an impression at least of the work done since the 80's to protect Seaford from the ravages of the sea.

My camera has developed an odd arc-shaped smudge top right. Wiping with my jumper hasn't worked. The camera shop tells me it is probably damage to the sensor and will set me back £60 to have it looked at.  Do any of my fellow blippers know anything about this?