Sidney the Rover Mystery Cache

They say that musical and mathematical abilities go together, so here you go:

a = John Cooper Clarke's hours
b = SLF's gate
c = Mary's form
d = Adverts' chords
efgh = Tom's motorway
i = Side 2, track 1 of NMTB
j = Bonny black hare day (day)
k = Bonny black hare day (month)

N 50 ((b+d^e+c!/e)(k!-j-√a)+g^e+(e+c)/e)/((e+jx√b)(j-c))
W005 (g^(k-e)+^(g/e)√h+i(h+d)+(h+e)/e)/(ek)+(d+(g+c)x√b)/((ke+d+e+√b)(j+a))

Please note, the cache is NOT at the hill fort, please don't look there

You can validate your puzzle solution with certitude.