Check out the quality on the BBCi player for free. Lots of content, probably none you would want to watch, but it'll give you an idea of quality. Also the are downloadable for watching off-line for up to 30 days or so. I think they might be protected so you can't write them to disk for viewing later . . . ? Probably some enterprising person has got a workaround for this.
I've tried a couple and even maximising to full screen gave fairly good quality.
Then you can view clips on Ch4 OD but you have to pay for full programs
Also check out click here for Charlie Says/ Rose & Petunia/ Jimmy Saville PI films - if you're the right age they will evoke some memories !!!