I've worked on seven (7) indie features here in the USA. Three of them looked into licensing well known "commercial" songs. As an example - The asking price for "The Middle" by Jimmy Eats World was US$50,000 plus points. At todays conversion rate that's about £29,742.45 GBP.
You're an indie filmmaker. Why not support indie bands/artists? Yeah, I know, it's nice to have that familiar touchstone in your project, but it's outrageously expensive. On the flip side, some bands will NEVER license their material. Led Zeppelin was one of those bands, although they eventually regretted not licensing "Dazed and Confused" for the film of the same name.
I've found songs for three of the features on which I worked, plus quite a few shorts. Yes, it can take a really long time to find just the right track, but the search can be worth it - not to mention that you might find a couple of bands/artists that are fun personally even if you don't use them in your film.
And there are literally thousands of indie composers who would live to score your project, a bunch of them right here on IndieTalk.