I was a student, almost due to graduate, and for some of that time had worked in another country with different VAT equivalents on food and non-essentials, and so on. In that country, the 'VAT' rate also changed while I was there, not a popular move, so can compare a bit. The stipend for what I was doing was approx £600 for 21 hours a month.
In the UK, I do remember Sainsbury's points and vouchers making a difference to the food bills - in that my partner and I would make decisions on a) Sainsbury's shopping instead of other places, and b) buying 2 of the same thing (and making a lot of use of the freezer) for the sake of the points and £5 back that would be reached earlier. Iceland also did quite a lot of 2 for 1 I think.
Cheap flights were at the best rates they were going to reach - fortunately for me, as this was the most I have ever used them, although I wasn't hopping home a lot at all. Somewhere between £35 and £65 for a 3hr one, I remember.
Mobile bills...felt high in the scheme of how much income I had. I was buying PAYG. No data and not tied in to contracts, though. Instead of home broadband I would use a cybercafe. Fellow users were trying to Skype, then, if they had a headset themselves, but it looked unreliable in the extreme and I gave up after a couple of tries.