I just got my assessment back for my 2nd year from Student loans, and £3,070 is this year's maximum tuition fee, which has (as suggested) gone up due to inflation - as the cost of staff wages go up with inflation, so must the contribution made by students. Same applies to college rents and stuff.
The maximum loan is the same though, so don't worry about it - you only need to worry if you don't qualify to go through student finance (e.g. an internation student).
All of us who started our courses this year will be paying that amount, so dw you're not being treated any differently to any other undergrad on the top-up fees.
If your friends say they're only paying £3,000, no offence but they're either lying, haven't checked what next year's fee is, or their university (for instance I believe Reading is one) doesn't charge the full fees anyway.