Recording online television clips

Hi everyone,

It’s my first post on here and I think this is the best place to ask

How do you save/record clips of television? Lots of people upload clips to YouTube etc but I’ve no idea how.

I really need the first 10 mins of last night’s BBC London news at 6:30.
Don’t want to go into detail but it’s really important.

Thank you in advance for any help you can offer