Agree with what many others have said that there are a lot of easy approaches to Helvellyn from the west, involving no scrambling. And by combining different up and down routes, you can get an excellent linear ridge walk, returning to your start point by bus.
But it's also possible to go up from the the east side without scrambling, starting from Glenridding, which is a lot nicer to start from than Wythburn or Thirlspot. For example go up via Sticks Pass, or (a shorter route) via the Keppel Cove zig-zags, then south along the main ridge, over Helvellyn and down to Grisedale Tarn, with a broad easy path back to Glenridding. Feeling energetic you could take in Sheffield Pike and Gleridding Dodd on the way up. Or, having reached Grisedale Tarn, could walk up to the gap between St Sunday Crag and Fairfield, then over St Sunday and down to Glenridding.