In reply to GrahamD:
Out through Troutbeck, up Kirkstone Pass (not bad from this direction) down along Ullswater and back around down the A6 (not that busy). It's about 60miles and really top notch.
Also, down through Endmoor, out towards Barbon, then Dent, Sedbergh, Kirkby Stephen, Tebay (along the old Kelleth road), then A685 back to Kendal.
Or the same as above but over the old coal road, then Mallerstang, Kirkby Stephen etc.
All the above are extremely nice and not too brutal hill wise.