The cache IS NOT at the given co-ords. Those are for the church ruins where some of the titular film was shot. It's a beautiful area and you can park close by. You don't need to go to the church to find this cache, but it's well worth a visit anyway.
Parental advice: This is a horror movie & a lurid one in places. You may wish to supervise your child's search, or do it yourself. Solve the puzzle. The cache is at:
N51° 3A.BCD
W000° 5E.FGH
Where -
A is the number of letters in the first name of the writer of the film's (very) original music.
BC is the year in which the actress (a future MBE) playing 'Villager (Uncredited)' portrayed an Innkeeper on TV. It wasn't in Eastenders...
D used to be a comment on a YouTube video of the cache site, featuring Mark Gatiss from his BBC4 History of Horror series... but it's been deleted, so: imdb.com/title/tt00DD849
E is the number of letters in the director's surname.
F is the film's year of release in the UK. January 197F (be careful!)
G: The actress who played Margaret (and later, Betty) lost her husband in 2009. Take the Ds and Os from his name. How many letters are left?
H is the number of letters in the first name of the actress who, on her first day of filming, badly cut her foot and had to be taken to a local hospital for stitches.
Good luck. Do this at night for extra thrills!