Hello Spartacus, thank you, honestly I appreciate your reply so much.
I've been bringing it to pretty good mechanics ( so I thought, I live in NI we are limited and to be honest I've actually found it extremely difficult to get a mechanic who will stick). I pay my bill up front and don't expect appointments next day or anything so I get a bit confused to why they are so flaky! Audi is 150 per diagnostic and then the parts and labour, I almost fell off my chair. Totally out of my price range.
Anyway, to update, my brother also uses the most recent garage and the guy replies to him and never replies to me so he spoke to him today and he had the headlight just can't get the haldex. I have opted to get the part repaired with a lifetime warranty. I can't afford any other way.
I maintained the car very well, it has been serviced twice a year and had a new timing belt and water pump st 78k I think (that's another story, of a dealer trying to ignore me until my warranty ran out lol) but thankfully the finance company stepped in. It seems the ball may be rolling now thank goodness. Can I ask about your final point regards reading it in for 7500? Is that what you mean? If that is the case I would be delighted with that. I need a new car anyway but I couldn't sell it as it is and without MOT. I was thinking of a Skoda kodiaq and it would have to be a trade in I think.
Wish me luck with the final bill, it will certainly be less than brand new parts but R.I.P to my bank balance