I've managed to get a better picture of the white stoat I've been watching.
It is still very elusive though and recently sightings have been particularly unreliable because buzzards, crows and even a rat have begun eating the rabbits I put out for it.
I captured it on video tool See below.
These sightings have inspired me to keep trying to photograph it and I have now built an underground feeding chamber for it which the buzzards and crows, at least, will not be able to get to.