All the information you need for this series at Father Ted 1 "Good Luck, Father Ted"
A female singer (a parody of Sinéad O'Connor) visits the island just when Ted is judging the annual Lovely Girls competition, a parody of Ireland's Rose of Tralee festival. (From Wikipedia).
The Questions for series 2, episode 7 - "Rock a Hula Ted"
How many 'lads' at the Lovely Girls competition? This is A
The position in the alphabet of the first letter of the winner of the Lovely Girls competition? This is B
So put your answers in the formula below to give you the co-ords for the cache:
N51 44.A(B-A-A)(A/2) W002 41.A(B-1)(A-1)
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