Then as you are local, please can I encourage you to do a costal walk along the North Berwick coast to identify the sea marker.  It should look like this:

https://www.geograph.org.uk/photo/7293589

which is taken from the next sea crossing up.  If you can find the sea marker, take a photo of it, and put it on the geograph website (or wikimedia) where it will be public domain, and then notify me.  Because accurate public domain sources for these pipeline markers are in short supply, and too many peope are just joining the ends of pipes they think might be connected, without a clear idea of what shape the pipe takes between. 