It took a while for the carers to make the emotional adjustments required (it was hard for them to stop feeding sugary treats) - but they really applied themselves and 8 weeks 6 days later, on a diet consistently mostly of soaked hay the horse came sound.
The horse is now in full work and has beautiful movement. The hooves? well they have deteriorated a little this past February (it's caught a lot of people out) so the grazing muzzle is going back on. The horse though is still sound.
Note, although the feet aren't as good as they could be, they are a major improvement on the recently deshod version.