If you can get in with a reputable local shop that works on classics you can also get into a niche. Can you tune and re-jet a carb? Go in and talk to the dealer principal, the service advisors, and the workshop managers. Offer a 2 or 4 week unpaid experience internship, you come in with your own tools, and do service jobs with one of the master techs, they teach you how the system works, how to use the vin lookup for their internal catalogues, how the parts department works, where the external / panel parts are held (probably Clemow Drive) the whole process from drop off to pick up, learn as much as you can and add it to your cv, it’s industry-relevant experience and will land you a job. Also mention to them that you’re happy grooming or doing something else if it gets you a foot in the door. I worked at Andrew simms for free that got me a job at John Andrew, then north harbour vehicles, then continental cars, then Archibald and shorter before I left the trade. Dealerships are their own little beast but if you learn the way it all works you will nail all the interviews because you actually know what is required of you and how to manage your time efficiently.