The brick top to the stone chimney intrigues me. There are parts of the building built from brick and others from stone, was the brick a later addition?
No, they are all bricks, but two different colours have been used. Yellow/brown "London Stock" bricks are very common in Victorian buildings in London - my own house has them. They are often used in combination with "brick red" bricks for decorative effect. The different colours arise from the chemical composition of the different clays from which they are made.
An example from the Interweb (not my house) - note the red brick courses level with the top and bottom of the upper storey windows.