Cheers guys. Well its something I probably shouldnt have tinkered with.
I noticed my front wheel was sitting slightly off centre. Ie, it was straight etc but sits slightly closer to the forks on the side of the disc brake.
So I took the wheel off (quick release) and reinserted to make sure it was sat correctly which it was, but I fear I may have bent something because upon reinstalling the wheel the disc/rotor now rubs against the outside/movable pad.
I did think maybe the caliper had been knocked out slightly. The rotor looks straight, and the wheel still sits closer to the forks on the disc brake side.
Been reading about wheel dishing, but I am pretty new to bike tech!