Oh and Lee , word of advice , if you are looking to sort the glow plugs you should get them all done if you are keeping the van , they will all start to fail now !
Also , at least a month before you want them done get yourself lots of WD40 and give them a good douse every couple of days , also try to make sure that the engine is as hot as possible prior to doing the job , tell your mechanic to leave it running in the yard before he starts , you don’t want one snapping off in his hands , that’ll be a big money job