The man made lake here frequently has swans swimming in it, clearly visible from the motorway, hence the cache name.
It's not to difficult to find the cache, however signing the log is considerably more difficult. You'll need special equipment to both retrieve and replace the cache, unless of course you are exceptionally talented! If you drop the cache you could spend some time finding it again, so be careful.
Please do not use the car parks outside the nearby buildings as the barrier at the entrance can be locked at any time.
Congratulations paulwelly73 on your first FTF