How to remove paint from a leather sofa

The problem with redecorating, and with painting especially, is that whilst your renovations tend to make one thing look nicer (in this case, scary, high gloss, dark grey coving circling the sitting room ceiling), they so often end up making other things look worse. Take, the coving for example.
Painting it white made an enormous difference to the room in that it now no longer appears to have a ring of smog around the ceiling. However, the paint also made an enormous difference to the lovely brown leather sofa that got splashed. Non-water based paints are almost impossible to remove. We tried water (obviously no difference), white spirit (the colour rubbed off the leather and drained from the boyfriend's face) and scraping it very gently when it had dried. A quick look online had me charging towards the kitchen to fetch the peanut butter, the vegetable oil and the butter, all of which I'd been assured would work but the boyfriend forcibly stopped me and insisted that we think it through. He's so cynical about the wisdom freely available online. Amazingly, it was nail varnish remover that actually turned out to be the best solution. However, the sofa has still got various sad little patches where our initial stain removal attempts failed miserably which led me to look around at possible replacements. I'm thinking their either of these budget-friendly leather sofas from DFS (suspiciously overjoyed model not included with purchase) would do nicely. I'm not quite sure how Santa is going to fit them down the boyfriend's chimney though. I bet the local council will need to be consulted for reindeer parking rights first.