Thanks for the responses on this guys.
Ulez isn't a requirement for me, and I don't think it will be for the 4 years I'll need this alphard.
I appreciate what you're saying about not letting milage be the deciding factor.
The 2 I'm looking at are:
1) white, low miles
https://www.newacreleisure.com/cars/toyota/alphard/mzg/1178403/
2) gold, higher milage
https://southcoastjapautos.co.uk/cars/toyota-alphard-2007-mz-g-edition-3-0-v6-petrol-fully-loaded-4wd-7-seater-pearl-light-gold-paint-beige-leather-interior/
Aside from milage and colour, the only difference I'm noticing is the white has a flip down dvd player and the theatre speakers. I'm not fussed about the dvd player and from what I'm reading about replacement head units the theatre sound may be more trouble than it's worth.
White looks a bit nicer, but it's my temporary dad wagon, so I'm not overly concerned with looks.
Am I overlooking anything obvious between these 2?
Edit: the gold one comes with a 2 year warranty, while the white one is only 6 months