Hi there, 

My A6 feels like it’s brakes are locked when driving, not so much that it doesn’t drive but enough for it not to be alert and feel normal. It seems to get worse - what could this be some kind of wheel part which needs replacing to hold the wheels in the right position or something like that..

complete novice but I like to hear if anyone had similar experiences and therefore know what it might be so I can predict the damage before going to garage🤑

Not had it on my Audi, but I had a seized brake caliper once on my Ford escort which made the brakes stick on slightly with one wheel. 

This could explain your symptoms. I'd be getting a garage to take a look in My opinion

Hello Rebecca,

I think the forum would benefit from a more detailed description of the symptoms, to be able to offer any constructive advice. One test you could do is to take the car on say a 5 mile run, then very lightly touch the centres of each wheel to feel if any are hotter than the rest - touch very lightly and tentatively, as if you would be testing to see how hot something is. 
If this were mine, and I was in your situation, then I would be getting the car inspected by a trusted local garage - the car is trying to tell you something! 
Kind regards,

Gareth.