Second Hand Pallet Racking, Shelving storage and Warehouse Racking systems, & storage containers. JJ Storage Systems, we are leading UK suppliers of second hand warehouse mezzanine floors, pallet racking and shelving systems. Bases in Wiltshire, we offer our products and equipment across London, Berkshire and the rest of the UK. With over 42 years' experience in storage solutions, our family run business has the skills and knowledge to offer the best advice along with high quality new and second hand products, whether you are looking for pallet racking, storage or mezzanine floors.