What pipe connection is this?

looks like an invisible throbnozzle to BSPT addaptor to me...

Looks to be the same as a Bosch injector to me? They're not a pipe fitting.

If it's a 14mm fitting, then one of these, possibly: www.efihardware.com/products/2358/14mm-Injector-Oring-To-Hose-Tail-Adapter-Steel

Before you ask, I've been looking for ages and can't find them in the UK.

Easy but crude: Remove the O ring and fit a short length of hose with a jubilee clip, down to an adapter.
Less crude: Drill and tap the hole to a suitable thread, and fit a hose barb with some PTFE tape or loctite thread sealer.

Ah so that's the fuel feed not the return - so it will be under a reasonable amount of pressure. In that case i'm going to look for another solution instead of a land rover fpr... thanks for the help.