Thank you. It was done by a company called Tailor Made Designs who I found on the internet. They designed the attic truss. The designer's name was Baz.
I went to Minera Truss as well but they said it couldn't be done with the ceiling height I wanted and the open space. It is supposed to be 2 bedrooms, a bathroom and a store room but I want to keep it open plan for now.
The truss will be quite a bit cheaper but I am concerned about the noise of people walking above.