I'd concur with Ed and Mole.
It may look a bit of a fag schlepping round the estuaries of the rivers Taw and Torridge (at, respectively, Barnstaple and Bideford) and it is 20-odd miles from Westward Ho to Hartland, passing Clovelly on the way. It's very pretty and its easy but it is not stunning or dramatic.
However, as you approach Hartland Point the SWCP starts to get interesting. The next 25-odd miles south past Bude to Crackington Haven has IMO some of the finest walking of the whole SWCP. The route is rugged with high cliffs and, except around Bude and Widemouth, it is remote and usually more or less deserted.
Of course, if you spent an evening studying OS 1:50000 sheet 190 ('Bude, Clovelly & surrounding area') you could work out a more-or-less direct route between Bideford and Bude across reasonably empty countryside with the only villages of any size being Buckland Brewer and Bradworthy. But I've just had a look at the map myself and I suspect you'd be walking mostly on minor roads because, away from the coastal strip and immediately round the villages, there seem surprisingly few public footpaths and bridleways that would hook up into an all-off-road route.
Me, I'd far sooner walk the wonderful windswept coastal path high on the cliffs above the Atlantic.