kiwijunglist: There is only one lot of wires in the room. I left him there to do his thing. I'm sure there were no splitters there before. Now there is 1x splitter box. I was paranoid, so I've triple checked. There is only 1 x splitter, as pictured. The rest is just a spaghetti of wires.
Either
1. He installed an ADSL splitter for my VDSL connection
2. He didn't do anything.
PS: He told me he installed a splitter for me.
Sorry to say but judgeing from the age of the two port connectors (yellowing with age - internal) that that is not a new splitter installation - BTW is there a flat #17 ? it may be for pr17
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Judgeing from the pic of the jack there will be a spliter somewhere else- but not the one you have shown - with the green/white pr off the splitter connected to the green/white of your cat5 that ends on the jack.