Thank you, John. Does anyone know why it was named Jump in the first place, please? There is another place in Yorkshire which was named Jump because the miners had to jump across a stream to get to and from their work. Roborough has a leat which Sir Francis Drake built in the 16th Century in order to convey water from Dartmoor to Plymouth. The only stream that I remember in the area was where the village's sewage works were sited but that was in a field below Tamblin's Garage roughly West of the village.
For the record, I have perused the 1931 edition of The Place-Names of Devon but can find no reference to Jump. The only reference I can find is on the Genuki website, Bickleigh near Plymouth, which reads "BICKLEIGH is a small village on the western side of the river Plym, in the picturesque vale to which it gives name, six miles N. by E. of Plymouth. Its parish contains 469 souls, and 2980 acres of land, including the village of Jump, and many scattered houses. Bickleigh Vale is much resorted to by anglers and the lovers of woodland scenery, who find excellent entertainment at Maristow Inn. . . . The manor was long held by Buckland Abbey, and afterwards by the Slannings, Modyfords, and Heywoods, the latter of whom sold it to S.M.M. Lopes in 1798. . . . The Church was rebuilt by Sir R. Lopes, in 1839, except the tower, which has six bells. The interior is neatly fitted up, and the east window is enriched with stained glass. . . . " [From White's Devonshire Directory (1850)]