Hi, I'm currently studying towards a physics degree at undergraduate level in the uk with the aim of then going on to do an MSc in maths before hopefully gaining entry onto a phd programme in either maths or a mathematical area of physics. Given this intention i am trying to gather a scope of opinion on whether it is worth switching to a maths undergraduate degree now (while i still can) or carry on with the physics or is this not much of an issue at undergraduate level? I do enjoy both subjects and have indulged in study away from my degree in other areas of maths (analysis & topology primarily) that are not options as part of the physics degree, but I'm concerned about my options in maths at post grad level if i have a physics rather than a maths degree. Also would a degree in physics and then an Msc in maths make it difficult to gain entry into a physics phd programme i.e. without an MSc in physics? Any advise or opinions are welcome.