This Ash tree has had two branches that had failed (fallen)in the past.
When we visited to survey for our client, we found the tree had Inonotus hispidus brackets (pictured example) on the main stem and in the crown which had decayed as a result.
So we had two options, fell or try to retain the tree. So, we cut back to the primary limbs to reduce the chance of failing again.
This will give the tree a chance to regrow now the decay has been removed and sound timber is left, giving it a few more years life 💛🌳