Information on tweed blankets

This week we have are looking for some information on two tweed blankets. 

The Unst Heritage Centre has been given one (pictured) with a label that I have never seen before. Does anyone know anything about this blanket? Who made it? Where? When? Anything would be useful. 

The Textile Museum has also been in touch. They are looking for information about a donation of an unusually coloured blanket which has been donated from Australia back to Shetland. The only clue on the piece is the name "Andrew Stewart" on a label. Can anyone help?