We've put more information about television on our phone and TV page. You can receive over 100 channels free of charge with Freesat and 48 with Freeview. 

For DVDs your best bet is your local library. Go and have a look - you'll probably be amazed at what a wide selection of current films they have, which they rent out for £2-4. Far cheaper than buying them, and whilst it might not be cheaper on a per film basis than an online subscription service, the problem with subscription services is that you end up paying whether you watch any films or not.

If you're into classical music, libraries typically lend out opera DVDs for free. Bigger libraries have a wide selection of pop, jazz and classical  CDs which you can borrow.

We gave up on a hi-fi years ago and just use our computer (with a decent sound card and speakers) to play music, DVDs and digital TV.