Why is one front rotor running than the other??(ufo's)

[iain.atkinson at tesco.net]

As you know i have just done the front rotors on urs4, the nearside is running hotter than offside (uk if that makes a difference) and it pulls a bit under braking to the left which it didn't before. I have just pulled the rotor and pads out on that side, can't see anything obvious (and yes Dave and others it is possible to pull it 15 minutes, thanks for the advice). Recleaned where the pads fit onto the caliper and a dab of copperslip again, piston moves fine in the caliper and the caliper sliders move freely too. Is this just a bedding process??? Should i be worried??

Thoughts gentlemen please.

Thanks

Iain