Wow, so I finally put my original VANOS unit back in. It's been a while since I rebuilt the solenoids and I've been using Mark's (SweetM3) spare unit in the meantime. Suffice to say I was very, very lucky to have that option and am very grateful.
Nevertheless I totally forgot about it until the other day and still had my rebuilt unit sitting in a bag in the garage! Needed to get Mark's back to his shelf.
So I swapped them over yesterday and today and checked my valve clearances at the same time (most between max and out of spec). Happy to report that it all went smoothly! Everything fired up first time and the VANOS passed the DIS test with flying colours!
This is (hopefully) my final VANOS journey now that not only have I done the seals and rattle kit, I've also cleaned and re-soldered the solenoids having dug them out of the gunk that a PO installed many years ago.
Touch wood!