Vermiculite: 

Horticultural Vermiculite has the excellent property of improving soil aeration while retaining the moisture and nutrients necessary to feed roots, cuttings and seeds for faster growth. Sold in medium & fine grade.

Perlite:

Horticultural Perlite is a unique volcanic mineral which expands from four to twenty times its original volume.  When expanded each granular, snow-white particle of Perlite is sterile with a neutral pH and contains many tiny closed cells or bubbles.  In addition, because of the physical shape of each particle, air passages are formed which provide optimum aeration and drainage. Sold in the most popular medium grade.

Both Available in 100 Litre Bags from Sinclair Professional at wholesale prices which include VAT.