thanks for getting back, I thought no-one was going to pick up this thread! Our house is near Andover. As you say, a huge decision. I have three kids, 10,9,7. The school they came from was an excellent village school. They have "sort of" settled into their new school (but academically it is way behind), never complained about going, seem to have made friends especially DD1 who is 9. However, DS, now 10, still really wants to go back to Hampshire and periodically gets upset about it, misses the other side of our family who live there. Our catchment school in Hants is no better than the school here, but we have just found out that we MIGHT be able to get them into another different, but also excellent, village school. There is no doubt they have not done so well here academically as if we'd stayed in Andover, and it's been a big source of guilt for me as they also loved the old school. I thought I was doing the right thing giving us some financial security with my new job, but seems a bit hollow at the moment. Financially things might be quite tight if I give up this job. I don't know how kids will feel about going back to Andover but yet another school.
I think you are right that the kids pick up the strains. Cornwall is lovely in many ways, and I will miss my family and the beautiful coast if we leave, however it somehow doesn't feel quite right, just too isolated , too peaceful. Knowing that there are things I will miss about it makes the decision even harder.
We have a family member in our Hants house, but they want to buy their own place, so will just be a bit sooner than planned.