Thanks to all!

It turns out that we were missing some cross braces - we worked out the rest
quite easily but couldn't find anything in the big bag of bits that would
reduce the wobble! The shelving came from my parents shop which they have
recently closed down due to serious illness and so its understandable that
they got forgotten. IIRC, they're only £1 or so from IKEA so we'll pick some
up next trip.

Thanks again,

Lloer