List price on the OL-1 starts from $45k, so I'd guess that'll probably translate to £35-40k over here, but I'm not sure how production capable it would be. Something like a TL-1 would be better (and cheaper!) for production work, but they're 3phase.

Another issue with getting single phase machines, is pretty much all commercial tool changers/coolant systems/chucking systems are only available in three phase.
Running a single to three phase rotary converter is an option, but I'm not sure if the phases would be balanced enough to run something CNC, or if they'd cause problems.