I have a range of sample books from companies that provide good quality fabric that meet the fire retardancy standards required for upholstery.

Links below are to suppliers which I think may be useful.

Linwood  

Good range of velvets, wool and linen.  Their website is great for showing how fabrics look on furniture.

Warwick Fabrics 

Nice range accross the board.

Modelli Fabrics

Good range and price point.

Moon Fabrics

Wool fabrics all manufactured in the UK

Bute Fabrics

Based on the Isle of Bute have been a specialised woolen mill for 75 years.

Black Pop

High end design company based in Derbyshire, fabrics manufactured in the UK.