Competitiveness of my CV as a law student

Hi, i am a current A level student who is deciding on their universities for LLB. I think i might go to Nottingham since i didn't take the LNAT and I am thinking about doing a study abroad for a year as they offer a study abroad program. However, I was also thinking it might also be a good idea to pursue a postgrad at Oxbridge in the future after i finish my undergrad. Which would be better for my CV when i apply to a firm since i didn't complete my undergrad at elite unis like oxbridge, LSE and UCL. Thank you.