For injectors - in fact all things P38, petrol and Diesels - give William Chetwynd a call.
If in stock, they'll be reasonably priced, tested and usually next-day delivery if you get him early enough.
Tel: 07903-167575
He's based in Lincoln.
That injector from William was perfect. I'd highly recommend him. Thanks for that @Jon Dor. Thanks to everyone else for their input too. I was perfectly happy living in Leeds but now feel the urge to move to France
Now I've got to troubleshoot what looks like a leak from the injector pump in the engine bay and intermittent EAS problems (like just about every other P38 on the road no doubt )
Anyone recommend a guide anywhere about removing the pump? Or a recommendation for a suitable in-line pressure gauge? Not sure what I'm looking for - are they all a standard fitting that will work with all parts of the EAS airlines?