Help please, i have a David unit Moretti dispencer but no kegs!!!!

[mandells]

Hi guys, I wonder if you could help me, I have recently bought via ebay a (private sale) a new Moretti David unit but am having no joy getting the kegs for it as I'm being told that they now come already pressurised in 20ltr kegs so mine possibly needs converting as I have a separate gas pipe connected to it, any help most apricated, if I need it converted is there anybody in the Croydon/surrey area that can help? I only want a cold beer, lol