This is a Betula pendula (Silver Birch) that was due to be reduced a few weeks ago. We got to the customers house who actually wanted the tree out as it was blocking light to her bedroom. This is a constant battle i'm forever having to fight :( If trees were planted correctly in a location that was well thought out, this tree and many others would hardly ever have to be touched but preventative tree care is another story i will tell another day.
In the end I persuaded the customer to have a large reduction. it ended up being 40-50% which is probably too much for this species but it was better than taking it out. Here's the result.