British Sea Power.
Super Furry Animals.
These are two seriously underrated British bands that really deserve much more recognition. British Sea Power have produced two fantastic albums, their debut 'The Decline Of British Sea Power', and their recently released follow-up 'Open Season'. Both albums sound quite derivative and underwhleming on the first couple of listens, but are real growers. 'Decline Of' is probably the better of the two (and one of my top 5 favourite albums), but it's also the heavier, with many of the melodies tucked away under guitars on overdrive. 'Open Season', is a much more polished affair, and is much more restrained. But both are great and recommended. Not only that, but they put on one hell of a live show.
Super Furry Animals are one of the most consistantly good bands around, who probably couldn't put out a bad album if they tried. 'Radiator' is probably the most straightforward indie-rock out of all their albums (along with 'Mwng'), but their best in my opinion is 'Guerrilla', which incorporates a much more electronic sound throughout.