Earlier this week, when the line-up for Richard Thompson’s Meltdown festival was announced, one name in particular will surely have raised a few eyebrows: Paolo Nutini. Among the appearances by serious old folkies and earnest young Wainwrights and an “evening of political song” that Thompson has planned for his stint as curator of the annual festival on London’s Southbank, a show from this young Scottish singer and songwriter seemed a bit of a lightweight choice; perhaps even a controversial one.