Audi dealership or specialist for 4 wheel alignment?

I need to get four wheel alignment done on my A6 Avant as the front tyres have been wearing unevenly on the inside since I bought the car (approved used) a few months ago. Planning to change the front tyres soon anyway so I obviously want to get the alignment sorted before putting new tyres on.

Does anyone have any experience with getting this done at a dealership vs independent specialist please and which would you recommend? I'm based in Hertfordshire if anyone has any recommendations locally? Sorry for all the questions today - I'm new to the forum and have a few things I'm keen to sort out.

Can a moderator please delete this thread as I inadvertently posted it in the wrong section and have now reposted in the correct section.