Can I purchase something online in United Kingdom and use my visa card?

Yes, you should be able to purchase items online in the UK and use your visa card for payment. A few products from the search results that could be useful for your time abroad are: The Apple 16-inch MacBook Pro listed for R56,999. As a student, a powerful and portable laptop like this MacBook Pro would be ideal for taking notes, writing papers, and staying productive from anywhere. The JBL Go Essential Bluetooth speaker for R674 is also a great compact option for listening to music or podcasts in your dorm room or when studying in the library. Both of these highly-rated products should serve you well during your time in the UK. Let me know if you need any other recommendations!