diesel injectors wanted, new or recon??

Hi guys.
Ive just found out my number four injector is naff, so im looking at replacing this, but figured the others have all done the same millage, so is it worth replacing??
ive noticed my mph has gone down in the last year from 24 to 21 around town, is this maybe a sign all the injectors could dowith being replaced?? or should i just save my money??

And secondly, does anybody know of a good place to either buy new or send for service exchange / reconditioning in west yorshire??

Thanks
Chris

Diesel Bob Tuning - The ultimate diesel engine tuning as well as a diesel fuel injection service. Repairs and reconditioning of injectors and diesel pumps, suppliers of diesel fuel system parts and additives

could try this guy, send em to him and he's your uncle. very well known and has loads of repeat business.

Can't help you with a supplier as the Garage replaced my number 4 injector and what a difference it made. It starts better, idles better, performs better and I now get better MPG as a result. They didn't replace the others so maybe you don't need to replace yours. But if you have a spare 750 then why the heck not.