Christopher, as far as I know, Grieger mounts on sheets of Acrylic, not glass - with variations as to the backing (DiaSec, AluBond). Anyway, I would place the order with Grieger and have it shipped to the UK. Grieger ist not the cheapest offer around, therefore shipping costs should not be the issue. As an artist preparing a show and committed to quality - I would even drive to Düsseldorf myself to pick up the order.
Angela