I would imagine as a road bike and with 2 bike models sharing the same frame should be 130mm. I know the Triban 100 just has a basic quality 7 speed freewheel and could be 126mm but if its the same frame as the Triban 500 it surely has to be 130mm. I think of 135mm as mountain bike spec but realise specs like these never stand still and dropout spacing keeps expanding as the number of gears keep increasing.
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Seriously, do you own one of them? Get out the ruler.
Are you going to buy one of them? Bring a ruler to the shop.
They won't be 135mm. As above, there is a small chance of them being 126mm. They are almost certainly 130mm.