I bought LHD Defender 110 SW 300TDI from Nene last year. It's a 2008 production car with "rest of the world" spec.
Talked with Nene people at Billing this year and they have brand new LHD 300TDI's in stock. You have to ask about RHD though. Ring up Tony or Andrew (http://www.neneoverland.co.uk) and ask for it. I'm sure they can help you.
As for price - depending on spec (with or without conditioning, etc) you might look at 17-18 K£.