Can anyone recommend a decent diesel injector specialist in or near Essex?

I took my Mondeo TDCi to a place in Tilbury and had 4 reconditioned injectors fitted and a year to the day they went again I took it back they sorted it out and said if they go a again I'm going to have to charge you and they are going again

I can remove them myself so could also possibly send them away?


Cheers Brian