Solution to Farewell by Hedge-sparrow

 Farewell by Hedge Sparrow - SOLUTION

The theme is the SEA SHANTY “SPANISH LADIES” whose third verse describes a voyage from USHANT (a French island at the extreme south-western end of the English Channel) to SOUTH (S) FORELAND (a chalk headland on the Kent coast where there is a famous lighthouse), passing by several other LANDMARKS on the way.  The ROUTE starts at USHANT, passing by SCILLY, (the) DEADMAN, RAME HEAD, START, PORTLAND, WIGHT, BEACHY, FAIRLIGHT, DUNGENESS, and finally anchoring off S. FORELAND.  Clashes in the grid give the names of the various landmarks (which are generally either headlands or islands, sometimes with lighthouses) in approximately their correct geographical locations, to be indicated in the completed grid with first and final letters in the cells where they occur.  The puzzle’s title is derived from the first line of the shanty: “Farewell and adieu to you fair Spanish ladies”.

Full solution and notes