I think he really really wants a Passat

he already discounted the 5 series and the A6 which are far superior to any passat in just about every conceivable way apart from price. Passat is the car you have when you have a crap company car scheme, not when you are looking to Chuck 18k at a interesting car.
See I’m not sure that’s right - I would suggest a pants company car scheme would have you in something French or Japanese. Renault, Peugeot, Citroen, Nissan, Toyota etc.
VW is another step up and sits with the likes of the mondeo and several volvos in terms of quality and image - it’s better than the Mondeo though.
A very good company car scheme offers BMW and Audi but you obviously pay for it in tax.
I had a Passat GT 2.0 TDi estate and it was frankly brilliant. Leather and alcantara, adaptive cruise, emergency break assist, full active drivers display (exactly the same as Audi’s), 18” alloys, electronically adjustable folding mirrors, dual zone climate control, heated seats, LED headlights, interior lighting trim, electronic tailgate, front and rear sensors with associated rear camera, blue tooth, touch screen, sat nav, voice control..... the list goes on.
I totally get peoples somewhat snotty feelings on the Passat - after all it’s very much middle of the road but it does everything very well and absolutely nothing badly.
Faced with a choice I would have course go BMW or Audi though - who wouldn’t, but the money always comes into it and for the spec and build quality, the Passat offers a huge amount to people - hence its massive popularity.
Generally they aren’t driven by bellends either.