You can get your bike serviced free of charge with the Bike Doctor on campus each month. Just take your bike and student ID card with you. The labour is free, but you'll need to pay for any replacement parts.
Check the following dates for when the Bike Doctor will be at Lansdowne or Talbot Campus throughout the year.
If you're currently studying on a Tier 4 student visa this presentation will give you an overview on some of the current immigration options to stay and work in the UK after your studies.