  We present a simple method for controlling the polarisation state of light at
the waist of a single-mode optical nanofibre. The method consists of complete
polarisation compensation based on imaging scattered light from inherent
inhomogeneities both on the fibre surface and in the glass material itself. In
contrast to the recently reported protocol exploiting two imaging systems
oriented at 45 degrees to each other, our method requires only one lens and a
video camera. It is particularly useful for nanofibre-based applications with
severe geometric constraints, such as inside vacuum chambers for experiments
with cold atoms. The measured fidelity of the achieved control is about 98\%
using lenses with moderate numerical apertures.
