Apparently, Snows, a decent wodge of newspaper around the frozen comestibles works OK for about a quarter of an hour or so.
Our freezer is jammed right up to the gills, as a dear elderly neighbour left, and gave us everything she had left!
Mind you, I've just taken a half-pound of Lurpak out (bought a load - it was on offer), so there's now space for a few joints of beef, half a pig, three gammon joints and a whole lamb...