Top up anti freeze

Went to the boat to top up the anti freeze - room for 1 litres - hope that doesn't indicate a loss of coolant -I suspect the loss is due to a cool day. 

Noticed on the way the work being done on stenson lock.  

Also went for a walk on the disused cromford canal at lower hartshay - this needs urgent work as the canal is being used as a dump by the local pig farm drain and it stinks really bad. The vegetation also needs clearing as the bit on water has burst its banks. Frustrating as this is an easy stretch to restore.