If the data below is the case why are the investment management platforms not targeting this demographic, particularly the students? 

According to HESA there were roughly 750k students at Universities in 2015/16 and STS research believes the average student has saved £475 … that is more than £356 million each year of investment potential

Banks have been enticing the younger demographic into their branches through railcards for years, however surely it is time for the likes of Fidelity, Selftrade, Interactive Investor, Vanguard to start building their future investment pipeline. 

I have no doubt the data by itself would be valuable, let alone the modest investment, which would be lucrative almost immediately for investment platforms.

Personally I use Fidelity, I wish I had got to grips with this at the start of university (big confession) and to any student or ‘millennial', I can't recommend taking advantage of funds and compound interest enough - as Albert Einstein famously stated: “Compound interest is the eighth wonder of the world. He who understands it, earns it... he who doesn't... pays it.”