Contacted these guys
Tyre Alignment in Southampton | Laser Wheel Alignment in Winchester this afternoon on recommendation from some threads on Pistonheads. The guy sounded really knowledgeable and if I took the car in he'd hook it all up and see what was going on for free. Then if I wanted, set it up how I wanted for around £40 and then I could go back in a week or so to check it again (if it had settled/moved etc), again free of charge.
That cost was just for the front end adjustment mind, but I said the rears are spot on fitment wise for me already, albeit a little more camber than factory!
He also said its far from straightforward just doing the fronts, if the rears are out of factory spec as its all related, but he'd sort it. I said tbh I just want my steering wheel straight and to avoid tyre wear rather than a fancy fast road set up etc.
The other thing he said was to get it done asap after lowering as once tyres wear unevenly at all, they continue this way, which will likely have a bigger impact than waiting for suspension to 'settle'.
Anyhow, I'll report back after I've been there.