I have to say, £100 doesn't sound like a huge amount to me, and I'm not hugely well off. I can't imagine it means much to someone already paying £200 pa for parking, and living in London, where everything costs more - half a York parking permit would be about £40, so on that scale, it's really peanuts, isn't it?
Also, of course, not enough for a half decent bike (plus stuff like lock, pump, waterproof jacket - all the stuff we tell newbies to budget for), unless you go second hand...