When you say 'scrape' it sounds as if the damage has gone lower than the paintwork. In that case, neither T-Cut nor anything else will help.
If the metal is bared or dented, the damage will have to be filled and repainted. Filler and touch-up paint are easily available in motor shops but it takes a fair amount of experience and practice to get a good result. I wouldn't recommend it Nicky if you don't have that experience. However, if you know a friend who does then it will be worth sweet-talking them as the filler, wet-and-dry paper and paint will only cost a few quid. It will take about a day.
Failing that, one of the local mobile mechanics/body repairers will do the work for a reasonable amount - even while the car is at your place of work. Otherwise, you will have to go through a local repair shop or the insurance, but that is the most expensive method.