http://fabricguild.co.uk/  

My mum and I are members, we go to the shop occasionally to get some fabric but I mostly get threads, fittings, needles, strapping and all sorts of bits and bobs.

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http://lowwoodsfurnishings.co.uk/ 

This place has really good sales, it's furnishing fabrics so they don't have lots suitable for clothes but I have had some amazing fabrics at massive discount.  I once got devore velvet that was down to £5 per metre from £75.

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https://www.charnwood.net/ 

They sell mainly woodworking machinery but they do have a stock of different woods and resin shapes and things useful for hand carving.