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Inflation adjusted, if >>415196 lad is to be believed, a £45K investment taken on in 2008 would still equal around £75K today. That's a 66 percent return on investment.
The problem with keeping a classic car, even if you just let it sit under a cover for ten years, is the upkeep. Ten years of just collecting dust is a long time even for a Ferrari. Rubber parts of any kind, for example, typically have a lifespan of some ten years. So a Ferrari that you put in your garage or your barn ten years ago will not only be unattractive to buyers today because you didn't have all the recurring servicing done by an authorised Ferrari dealer (true Ferrari collectors will turn their nose up at any specimen that was serviced by an independent shop), but you are going to have to replace anything from a timing belt to a water pump and probably each and every water hose. And by a Ferrari dealership. That's going to shave an easy £5,000 off your profit, more likely £10,000... because again, you will have to catch up on ten years of neglect.
One of my mates worked for a boss once who drove a Ferrari 348, which is often called the Testarossa's little brother. By and large, he said he had to set aside around £5,000 every year for all the maintenance recommended by Ferrari.
A classic car like that is only a worthwhile investment if you have the means to store it properly and have it maintained. The best kept Testarossas in factory condition now run for upwards of £140,000. So if you bought one ten years ago for £45K, which was about the top end back then, deducting £5,000 every year, you would still only have a profit of £45K before inflation. But again, that needs to be put in perspective to all the maintenance work you would have to do on your "barn find" testarossa to get it back into a state where most buyers would actually be interested.
Long story short, if all you have is a chunk of money and want to make a profit off it, you're indeed better off investing in things like stocks or index funds. Or if you still feel tempted to buy a classic car as an investment, get one that's a little more practical, which you can afford to run and service regularly, and where proper servicing by an authorised dealership doesn't make a difference of £40K in eventual resale value.