Reasons for pulling to left?

[lolsteve]

Pretty sure it's not in my mind but the car seems to pull to the left on the motorways and can feel a bit...floaty? unconnected?

Went to get tracking sorted and they say it's 1 degree out if that and not worth having it done since it wouldnt make a difference. Also said the tyres seem in good condition with even wear. Tyre pressure if fine on them both with the difference being a couple of psi

While car was in the area they tyre people had a quick look about and said nothing seems broken/damaged. Had a quick look at the springs and said they look fine too.

Anything else I can check? Driving from tuh' nurth tomorrow to Coventry and would like to make sure it's not going to have a paddy on the hard shoulder