If your purchase is more than the Section 75 limit, but still using some form of credit, you may be covered by Section 75a – but it's a bit more complicated than Section 75.
Section 75a covers things costing over £30,000, up to £60,260. But for a purchase to be covered, the finance must be properly linked to an item (known as a debtor-creditor-supplier agreement), so that the finance firm can see a clear relationship between the money and goods.
For example, if you used a personal loan to buy a £40,000 car, you wouldn't be covered if as you could have used that to buy anything. However, if you arranged a loan, specifically for the car, through the car dealership, that would be covered.
The other big difference is that under Section 75 you can take your complaint to either the good/service provider OR to the credit provider, as they're both jointly and severally liable. But under Section 75a, you need to have unsuccessfully complained or tried to complain to the supplier (if they still exist) BEFORE you can make a claim to the credit provider.