Could be a lot of things... Bedding, something loose, not quite centered caliper, flexy fork. Make sure everything is tight and centered, headset too, clean pad and rotor. If that doesn't work bleed and new pads may solve it.
Cheers.
Have worked through the bedding in, checked headset and caliper centring and bolts. Rotor looks slightly out of true. Will probably have a crack at that and then cleaning pads and rotors.
Brake judder on the front disk- Is this caused by contaminant on the rotor?
(I thought I'd done an OK job bedding everything in at the start)