I bought a Farm Jack 48" for £25 from this guy .. g1kwo .. on Ebay, thinking I'd have to take my chances.
But the jack is pretty well like a High Lift / Jackall, some differences, but seems to work just fine, it's mechanism was a bit tight to begin with, but lifts the 110 in the gravel on the drive just fine.
Definately worth a look, and he seems to have them regular, I did see him selling them £5 cheaper the other day.