In that case the rules have been altered since my student days. Back then we could vote in two different locations for General Elections as well as local ones. Indeed, I did this on one occasion. I voted in Bangor on the Thursday morning of the GE and then decided that my parents might delight in my presence for an extended weekend, so I drove over to Stockport and cast my ballot there as well. Lucky Mum and Dad!
Of course, this was back in days of yonder when voting appeared to make a difference to the country and to the society that we live in. The counting of the ballots was taken very seriously, and the declared outcome could be trusted to be accurate and genuine. A world we have now lost, especially since the events of 2016.