Wow, must start with a big thanks for all the helpful replies so far.
The house is built on clay soil and just over 100 yrs old with no cellar. As far as I remember there was nothing on the survey.
Our neighbour has a tree which is taller than our house and close to our boundary, it's about 3m from the corner of our house next to our front bay window.
After last summer cracks appeared running diagonally down from the bottom of our front bay window. We have been trying to get the...