EX BG Van Parasitic Drain

[casual1974]

Has anybody solved this yet, In last 6 months this has just become a problem - replaced 2 x Batteries - AGM - Van 2016 2.0TDI.
Ive just purchased one of the remote control battery isolators but due to the location of battery negative terminal - struggling to fit without having to bastardise cables etc. It's a nightmare disconnecting my battery every night. I know the van still has som ex BG equipment still installed - could this be issue - Van was fine for the first 8 months - the first time it drained I thought I had possibly left something on. After 2nd battery drained I suspect I now have a big parasitic drain but can't understand why it was OK for the 1st 8 months I owned van - Any ideas lads / lasses?