I am interested in buying a motorcycle in Spain, driving it through Europe and then selling it when I get to England. Has anybody done this or something similar? Was it more exciting and did it cost more or less?

I am studying abroad here in Madrid and I am interested in buying a second hand motorcycle or scooter. With it, I want to drive around Europe this summer and then resell it when I get to England if possible. Does anybody know the laws related to buying a motorcycle in one country and driving to another to sell it? I am sure there is a bunch of paperwork involved but I thought this would be a more fun and more personal way to see Europe. Another thought was to maybe ship it back to the US. Any suggestions?