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I'm Leeds based so possibly not much good to the majority of you London types on here! Thanks @NurseHolliday, good advice!
ltc-
If you've not changed a head unit before, then a quick run down:
Your van is probably only wired for 2 speakers, but it'd be worth checking online if the van comes in minibus format and all models are wired the same, in which case the wiring for rear speakers will already exist and it's just a case of plugging them in.
If not, new head units (about £60 from Halfords for a Sony or Alpine with a USB and/or Aux in, maybe £120 for one with Bluetooth for the hands free) come with an ISO adaptor at the end of the head unit loom. You can either buy an ISO converter for the van's loom, or chop the connector that plugs into the van's original head unit and wire it to a universal ISO connector using a wiring diagram. There will be 8 wires for 4 speakers, + and - for 2 front and 2 rear on most head units. You just want to connect the new speaker wire up to the + and - for the 2 rear speakers
NurseHolliday
Someone was asking where they could get hold of a van last week.