Hi Bernard - thanks for looking at this.  I'm still learning about how all this works.  I made a mistake in copying an image of a single block which was placed in the area which had the associated image - I didn't look at the image and realise it does not reflect the current position of the blocks.  The blocks on the north of the track have been moved from where they were in the image to prevent access to the track which runs NW from their position, they are in a crescent shape which is rather strange.  The two sets of blocks on teh south of the road are placed to prevent vehicles going off the track at that point (I think there is a gate to stop vehicles going south and the blocks prevents vehicles going round the gate but i can't recall).  I was there on Monday, not to do mapping as such but I noted the blocks were not mapped so have added them in.  

In short - yes they are right, but the image is wrong so I've removed it.

Andy
