The First Time Ever got to #14 with Roberta Flack in 1972 and paid for Ewan & Peggy to produce Kitty.

And an Oysterband sub-group called Fiddler's Dram took Day Trip To Bangor to #3 in 1979. Though I hardly think it counts.

Nor, really, does The Battle Of New Orleans which Lonnie Donegan took to #2 in 1959.

Probably Rod Stewart did best with Maggie May in 1971.