The UK's largest and most secure self storage facility With nearly 20 million sqft of space, Speedstore the UK's largest PD5454 certified, dedicated secure self storage facility. Positioned 600 ft below ground, we guarantee you of a distinct protection from natural and man-made disasters. Speedstore's underground location, offers consistent temperature range and moisture levels and is naturally free of the hazards of UV light, vermin and flooding. It doesn't matter if you want to safeguard the crowns & sceptres, keep your treasured wine collection, warehouse your business documents or preserve your delicate historic records & artefacts, select Speedstore Secure Self Storage, the only PD5454 "Quad Shield" Protected, Climate Controlled, Managed Secure Storage comany in the UK.