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The van has an aftermarket alpine head unit, I'll find out what model and Google what I need tomorrow, sounds a lot simpler than I'd thought!
ltc-
Yep, should be a case of running new speaker wires if they are not already there.
If you google "Alpine DIN ISO plug diagram" you'll get results like:
Alpine should be standardised and from a very foggy memory that linked diagram looks correct. If the speakers aren't wired there'll be a few inches hanging out the back of the plug that you can strip and connect the speaker cable to.
TRA
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