War memorial#372 brentwood Mystery Cache

This is a mystery cache to remember the men who fought in ww1 and who came from Brentwood as this is a mystery the cache is not at the published coordinates 

Traffic island garden. WW1 memorial central within garden. Stone cross mounted on four octagonal stone steps. Top three steps bear metal plaques with names. WW2 memorial. Wall parallel with Shenfield Road with 17 metal plaques with names. Since 1946 Memorial. Stone block, with inscription, positioned between two stone benches.WW1. A TRIBUTE TO THE MEN OF BRENTWOOD, GT AND LITTLE WARLEY, HUTTON, SHENFIELD AND SOUTH WEALD WHO LAID DOWN THEIR LIVES FOR KING AND COUNTRY IN THE GREAT WAR 1914-1918 AND WHOSE NAMES ARE HERE INSCRIBED. LORD GOD OF HOSTS BE WITH US YET LEST WE FORGET LEST WE FORGET PASS NOT THIS STONE IN SORROW BUT IN PRIDE AND MAY YOU LIVE AS NOBLY AS THEY DIED. WW2. TO THE FALLEN 1939 - 1945SINCE 1946 Remember With Pride And Gratitude All Those Fallen In The Service Of The Crown In War And Conflict Since 1946 Plaque with ceremony details / We Will Remember Them. Walls: TO THE FALLEN 1939-1945/ 

Now for the cache 

this puzzle is really easy and won’t take you very long 

world war 1 started in 28th July 1914 and ended 11th of November 1918 how many years did the war go on for this =A

world war 2 started in 1 september 1939 and ended 2 September 1945. How many years Did the war go on for this =B

the final is N 51°37.(A-1)(B-1)B E 000°18.(B-1)A(A-A)