Thanks for chiming inBit late in reply, but yes, no issues in putting tyres on prior to springs. In fact when the wheel alignment is done after the spring install, it'll work better to have the tyres on there too.
Did you get the work done yet? Happy with the setup?
Just dropped the car in for a set of Cooper Zeon LTZ 255/55/19.
Have been dealing with a mechanical issue, which is delayed requiring parts from UK, so have delayed the springs until that's sorted... wouldn't want to provide an avenue for buck-passing.
Should hear back this afternoon if the fitment went well.