On some social things they certainly do appear more progressive - which is why I think they attract the student support* and so on. I believe there is a layer of people who vote based on social policy rather than economic policy, for various reasons. However, their immigration policy, which is rooted in both economics and social policy, is anything but progressive or left wing. You could argue that where the 'real' politics happens is in terms of the economy, public spending, class-based policies. In this sense, they are not left wing.