Good luck in finding ANYTHING left hand drive in the UK these days for a good price....
I had a good thing going about 5 years ago buying LHD stuff in the UK and taking across to France where we would register it and punt it off for nearly double the money.....nowadays,there are so many dealers that have set themselves up selling LHD stuff that as soon as something comes on the market it gets snapped up and advertised soon after for some seriously unrealistic money.
Prices in the UK for LHD stuff are now nearly identical for what i can buy it for in France!
As Horacebat says, try the x-MOD stuff but be prepared for a seriously basic and un-refined Landy. Withams sometimes has LHD United Nations vehicles in a very fetching shade of......ermmm...white
You might get lucky and find something on Flea-bay but from previous experience, a decent landy in LHD guise will be like looking for rocking horse s**t.
good luck with your search