For connecting to a TV, easiest thing might be to buy an RGB to SCART cable from eBay. Less than £15, good picture quality.

Good summary of potential disk/drive issues and cleaning options: http://www.retrotechnology.com/herbs_stuff/clean_disks.html. Spatula-shaped cotton wool buds are handy for cleaning drives, as there might not be much room inside.

As per the article, http://stardot.org.uk/ is a good resource for all things BBC Micro in general.

Purchase a scan converter. There is a popular OpenSource project and many manufacturers are making them. Several support RGB, S-Video, RF, VGA and SCART and can upscale to something a 1080p HDMI TV/monitor can use. Supremely useful for all of those retro consoles and computers in our modern day. Kaicco is the more popular brand for the project, though I don't think that one supports S-Video.

Edit: You can connect a BBC Micro (and many other 8-bit micros) to the standard OSCC. It simply doesn't have the plug on the board, you will need an adapter cable.

Be aware that a couple of mains-rated capacitors in the power supply don't age very well and it's almost a given that they should be replaced ASAP and before any further use of the computer.

https://www.retro-kit.co.uk/page.cfm/content/BBC-Micro-PSU-X...

I'd love to have a beeb to play with (I just missed the wave first time around - went from PET at school to PC at work), but they are going for silly prices on ebay. Maybe a garage or junk sale will turn up something!

Have a look here then ;) https://retrohax.net/beeb-errr-bbc-micro-restoration-and-upg...