Artichoke Mystery Cache

Hogback Wood, owned by The National Trust, provides birds with opportunities to shelter, nest and feed. Among those seen or heard regularly are great spotted woodpecker, tree creeper, nuthatch, sparrowhawk, tawny owl, goldcrest, blackcap, chiffchaff, buzzard and red kite.

The cache is not at the published coordinates but is less than 800 metres distant. To obtain the coordinates you must solve the puzzle given below. 

The following puzzle is based on a capital idea that I discovered in another mystery cache.

 E V B T U R K N L S P M B R Z _ N G T Z V R S K X J D J G P V _ A O _ R H B U _ L Z F D _  I V G T Z Z

 X X X _  X X X _ X X X X X  _ X X X X _ X X  _ X X X X X X X _ X X X X _ X X X X _ X X X X _ X X X X X X 

 E V U G Q Y M U N I F P _ S N M J M D D T N E I R H T O A M T Q L B K N T Z C M I Z N _ L U T _ _ _ E V 

 X X _  X X X X X X X X X _ X X X X X  _ X X X _ X X X _  X X X _ X X X X _ X X X X _ X X _ X X X _ X X _ X

 R B V G F W U I  Y I  O D _ Z  I L S D Z O V U M V T  U K F 

 X X  X X X X X _ X X X X X X X X _ X X X  X X X X X  _ X X E N _ A N D _ D I D _ T H E _ C O U N T E N A N