You can buy these fibres for spinning and dyeing and many more;
Blue Faced Leicester (BFL) Wool Tops: BFL is a British wool that is highly prized for its similarity to mohair and for its attractive, silky, lustrous yarns. Blue-faced Leicester dyes very well and felts easily and quickly to a smooth, silky finish. This beautiful British fibre comes in natural cream, oatmeal and brown colours.
Shetland Wool Tops: Shetland is a soft traditional British wool that is very easy to blend either with other wool colours or with exotic fibres in a hand carder or drum carder because of its shorter staple length.
Shetland-Tussah silk 50% Blend: Feel & see the luxury of silk in this 50% Tussah silk blend with the added warmth & stretch of wool. Blends with less than 50% don’t look like silk. You need at least 50% to both feel and see the silk.